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#### Arithmetics. Mental maths , Mathematical logic (other)

Carpenters were sawing some logs. They made 10 cuts and this produced 16 pieces of wood. How many logs did they saw?

#### Arithmetics. Mental maths , Paradoxes

The tower clock chimes three times in 12 seconds. How long will six chimes last?

#### Arithmetics. Mental maths , Volume of a parallelepiped

A cube with a side of 1 m was sawn into cubes with a side of 1 cm and they were in a row $($along a straight line$)$. How long was the line?

#### Arithmetics. Mental maths

It is known that in January there are four Fridays and four Mondays. What day of the week is January 1st?

#### Arithmetics. Mental maths

The natural number a was increased by 1, and its square increased by 1001. What is a?

#### Arithmetics. Mental maths , Pigeonhole principle (other) , Sorting in increasing (decreasing) order

10 people collected a total of 46 mushrooms in a forest. It is known that no two people collected the same number of mushrooms. How many mushrooms did each person collect?

#### Arithmetics. Mental maths

A rectangle of size $199\times991$ is drawn on squared paper. How many squares intersect the diagonal of the rectangle?

#### Arithmetics. Mental maths

In January of a certain year there were four Fridays and four Mondays. Which day of the week was the 20th of January in that year?

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