BRAIN TEASERS
The Most Difficult Tasks (page 101)

The Most Difficult Tasks (page 101)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1001 to 1010.
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Calculate the number 700

NUMBERMANIA: Calculate the number 700 using numbers [4, 6, 2, 9, 16, 822] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
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Find number abc

If cb293 - c0c77 = 5a1b find number abc. Multiple solutions may exist.
Correct answers: 1
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#brainteasers #math
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Calculate the number 739

NUMBERMANIA: Calculate the number 739 using numbers [2, 4, 6, 5, 69, 169] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
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#brainteasers #math #numbermania

Smart kid

Bill and Marla decided that the only way to pull off a Sunday afternoon quickie with their ten-year-old son in the apartment was to send him out on the balcony and tell him to report on all the neighborhood activities.

The boy began his commentary as his parents put their plan into operation. "There's a car being towed from the parking lot," he said. "An ambulance just drove by." A few moments passed.

"Looks like the Andersons have company," he called out. "Matt's riding a new bike, and the Coopers are having sex."

Mom and Dad shot up in bed. "How do you know that?" the startled father asked.

"Their kid is standing out on the balcony too," his son replied.

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Find number abc

If b2cc4 - 28b2b = 33a28 find number abc. Multiple solutions may exist.
Correct answers: 1
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#brainteasers #math
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Calculate the number 778

NUMBERMANIA: Calculate the number 778 using numbers [3, 4, 2, 4, 13, 146] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
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#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A*B+C

The aim is to place the some numbers from the list (4, 6, 10, 15, 31, 32, 33, 34, 36, 37, 38, 65) 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.
Correct answers: 1
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#brainteasers #math #magicsquare
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Find number abc

If 4c649 - a09b2 = b77a7 find number abc. Multiple solutions may exist.
Correct answers: 1
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#brainteasers #math
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Calculate the number 472

NUMBERMANIA: Calculate the number 472 using numbers [9, 2, 1, 8, 12, 526] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
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#brainteasers #math #numbermania
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Find number abc

If 77b8c + 44bba = cbc5ac find number abc. Multiple solutions may exist.
Correct answers: 1
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#brainteasers #math
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Calculate the number 5925

NUMBERMANIA: Calculate the number 5925 using numbers [9, 7, 8, 6, 65, 782] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
CHECK ANSWER
#brainteasers #math #numbermania
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Rayon

In 1902, the "making of cellulose esters" was jointly patented by William H. Walker, Arthur D. Little and Harry S. Mork of Massachusetts. (U.S. No. 709922). A month later, on 28 Oct 1902, they also patented artificial silk (No. 712,200). Viscose was an early name for the product. The term rayon was adopted by the textile industry in 1924 to replace "artificial silk" and similar names. It was said to derive from the French for "shine" - a reference to its silklike lustre. Unlike most man-made fibers, rayon is not synthetic. Made from wood pulp, a naturally-occurring, cellulose-based raw material, rayon's properties are more similar to those of natural cellulosic fibers, such as cotton or linen, than those of petroleum-based synthetic fibers such as nylon.
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