Daily Brain Teasers for Tuesday, 21 July 2026
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puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, stereograms, ... |
What a winning combination?
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
#brainteasers #mastermind
Calculate the number 6585
NUMBERMANIA: Calculate the number 6585 using numbers [9, 7, 7, 9, 62, 790] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
#brainteasers #math #numbermania
Find number abc
If a896c + 4b7a5 = 7a685 find number abc. Multiple solutions may exist.
#brainteasers #math
MONDAY: It's fun to cook for...
MONDAY: It's fun to cook for Tom. Today I made angel food cake. The recipe said beat 12 eggs separately. The neighbors were nice enough to loan me some extra bowls.
TUESDAY: Tom wanted fruit salad for supper. The recipe said serve without dressing. So I didn't dress. What a surprise when Tom brought a friend home for supper.
WEDNESDAY: A good day for rice. The recipe said wash thoroughly before steaming the rice. It seemed kind of silly but I took a bath anyway. I can't say it improved the rice any.
THURSDAY: Today Tom asked for salad again. I tried a new recipe. It said prepare ingredients, lay on a bed of lettuce one hour before serving. Tom asked me why I was rolling around in the garden.
FRIDAY: I found an easy recipe for cookies. It said put the ingredients in a bowl and beat it. There must have been something wrong with this recipe. When I got back, everything was the same as when I left.
SATURDAY: Tom did the shopping today and brought home a chicken. He asked me to dress it for Sunday (oh boy).For some reason Tom keeps counting to ten.
SUNDAY: Tom's folks came to dinner. I wanted to serve roast but all I had was hamburger. Suddenly I had a flash of genius. I put the hamburger in the oven and set the controls for roast. It still came out hamburger, much to my disappointment.
GOOD NIGHT DEAR DIARY. This has been a very exciting week. I am eager for tomorrow to come so I can try out a new recipe on Tom. If I can talk Tom into buying a bigger oven, I would like to surprise him with chocolate moose.
TUESDAY: Tom wanted fruit salad for supper. The recipe said serve without dressing. So I didn't dress. What a surprise when Tom brought a friend home for supper.
WEDNESDAY: A good day for rice. The recipe said wash thoroughly before steaming the rice. It seemed kind of silly but I took a bath anyway. I can't say it improved the rice any.
THURSDAY: Today Tom asked for salad again. I tried a new recipe. It said prepare ingredients, lay on a bed of lettuce one hour before serving. Tom asked me why I was rolling around in the garden.
FRIDAY: I found an easy recipe for cookies. It said put the ingredients in a bowl and beat it. There must have been something wrong with this recipe. When I got back, everything was the same as when I left.
SATURDAY: Tom did the shopping today and brought home a chicken. He asked me to dress it for Sunday (oh boy).For some reason Tom keeps counting to ten.
SUNDAY: Tom's folks came to dinner. I wanted to serve roast but all I had was hamburger. Suddenly I had a flash of genius. I put the hamburger in the oven and set the controls for roast. It still came out hamburger, much to my disappointment.
GOOD NIGHT DEAR DIARY. This has been a very exciting week. I am eager for tomorrow to come so I can try out a new recipe on Tom. If I can talk Tom into buying a bigger oven, I would like to surprise him with chocolate moose.
Which is a winning combination of digits?
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
#brainteasers #mastermind
Atomic nucleus recoilIn 1904, a letter in the journal Nature*, Harriet Brooks pointed out a peculiar type of volatility shown by an active deposit of radium immediately after its removal from the emanation. Hahn and Russ and Markower later showed (1909) that “the effect was due to the recoil of radium B from the active surface accompanying the expulsion of an alpha-particle from Radium A. This method of the separation of the elements by recoils ultimately proved of much importance in disentangling the complicated series of changes in the radioactive bodies,”according to Ernest Rutherford (1933). Thus, Harriet Brooks was probably the first person to observe the recoil of the atomic nucleus as nuclear particles were emitted during radioactive decay.(*vol. 70, p. 270) |
Calculate the number 3160
NUMBERMANIA: Calculate the number 3160 using numbers [1, 8, 1, 2, 73, 335] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
#brainteasers #math #numbermania
MAGIC SQUARE: Calculate A*B+C
The aim is to place the some numbers from the list (6, 17, 18, 20, 21, 28, 29, 31, 53, 56, 64) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A*B+C.
#brainteasers #math #magicsquare
Find number abc
If ab12c + ba6b3 = 1b3cc0 find number abc. Multiple solutions may exist.
#brainteasers #math
What a winning combination?
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
#brainteasers #mastermind
Calculate the number 2473
NUMBERMANIA: Calculate the number 2473 using numbers [7, 6, 5, 4, 29, 960] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
#brainteasers #math #numbermania
Find number abc
If 8cb7b - b1cac = a1a4a find number abc. Multiple solutions may exist.
#brainteasers #math
