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

## Find the right 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.**28**

**Nílton Corrêa de Sousa**.

## Calculate the number 1558

NUMBERMANIA: Calculate the number 1558 using numbers [9, 6, 6, 3, 71, 280] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.**10**

**Nílton Corrêa de Sousa**.

## MAGIC SQUARE: Calculate A-B-C

The aim is to place the some numbers from the list (5, 8, 11, 18, 21, 24, 31, 67, 70, 73, 84, 95) 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.**9**

**Nílton Corrêa de Sousa**.

### Tea set

A girl was given a tea set for her second birthday. It became one of her favorite toys, and when her mother went away for a few weeks to care for her sick aunt, the toddler loved to take her father a little cup of tea, which was just water really, while he was engrossed watching the news on TV. He sipped each "cup of tea" he was brought and lavished generous praise on the taste, leaving the little girl immensely proud.

Eventually the mother returned home and the father couldn't wait to show her how his little princess had been looking after him. On cue, the girl took him his "cup of tea" and he sipped it before praising it to the heavens.

The mother watched him drink it and said: "Did it ever occur to you that the only place she can reach to get water is the toilet?"

## Find number abc

If b1a30 + 6c047 = c0a77 find number abc. Multiple solutions may exist.**30**

**Nasrin 24 T**.

## 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.**32**

**Nasrin 24 T**.

## Calculate the number 3508

NUMBERMANIA: Calculate the number 3508 using numbers [4, 3, 1, 9, 54, 605] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.**10**

**Nílton Corrêa de Sousa**.

## Find number abc

If bc17a - 6a575 = 255cb find number abc. Multiple solutions may exist.**18**

**Nasrin 24 T**.

## 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.**27**

**Nasrin 24 T**.

## Calculate the number 2815

NUMBERMANIA: Calculate the number 2815 using numbers [1, 4, 4, 1, 27, 203] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.**11**

**Nílton Corrêa de Sousa**.

## MAGIC SQUARE: Calculate A-B*C

The aim is to place the some numbers from the list (5, 8, 10, 13, 16, 18, 37, 40, 43, 45, 67) 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.**10**

**Nasrin 24 T**.