## Monthly Archive - March 2020brain teasers, puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1 to 10. |

## 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.**26**

**Fazil Hashim**.

## Calculate the number 3040

NUMBERMANIA: Calculate the number 3040 using numbers [6, 9, 2, 7, 71, 319] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.**15**

**Nílton Corrêa de Sousa**.

## Find number abc

If b89aa - 2b608 = a13cb find number abc. Multiple solutions may exist.**28**

**Anas Diab**.

### An act of kindness....

A travel agent looked up from his desk to see an older lady and an older gentleman peering in the shop window at the posters showing the glamorous destinations around the world. The agent had had a good week and the dejected couple looking in the window gave him a rare feeling of generosity.

He called them into his shop and said, "I know that on your pension you could never hope to have a holiday, so I am sending you off to a fabulous resort at my expense, and I won't take no for an answer."

He took them inside and asked his secretary to write two flight tickets and book a room in a five star hotel. They, as can be expected, gladly accepted, and were on their way.

About a month later the little lady came in to his shop.

"And how did you like your holiday?" he asked eagerly.

"The flight was exciting and the room was lovely," she said. "I've come to thank you. But, one thing puzzled me. Who was that old guy I had to share the room with?"

## 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.**43**

**Nílton Corrêa de Sousa**.

## Calculate the number 1190

NUMBERMANIA: Calculate the number 1190 using numbers [8, 6, 8, 5, 20, 615] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.**7**

**Nílton Corrêa de Sousa**.

## MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (8, 12, 15, 16, 27, 31, 33, 34, 37, 40) 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.**14**

**Nílton Corrêa de Sousa**.

## Find number abc

If 98015 - ba771 = a12cc find number abc. Multiple solutions may exist.**34**

**Nílton Corrêa de Sousa**.

## 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.**24**

**Nílton Corrêa de Sousa**.

## Calculate the number 8208

NUMBERMANIA: Calculate the number 8208 using numbers [6, 7, 9, 3, 25, 807] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.**9**

**Nílton Corrêa de Sousa**.

## Find number abc

If 9a76b + ba769 = acb5bc find number abc. Multiple solutions may exist.**26**

**Nílton Corrêa de Sousa**.