How many are all the possible digits that can be placed instead of @, so that 2015 < 2@15 would be true?

I thought of a number. I added it to 222 and got 1,000. The number I thought of is:

How many are the 5-digit numbers that do NOT have 9 as a units digit?

How many sheets of paper are there between the 3^rd and the 101^st pages of a book?

Fill in the missing number in the blank.
____   $\div$  20 + 15 – 2,015 = 0

Find the value of 2,015 – 1 + 3 – 4 + 6 – 7 + 9 – 10 + 12 – 13 + 15.

There were 1,001 pieces of paper. Some of them were cut into three parts. Altogether, there are now 2,015 pieces of paper. How many pieces were cut into three parts?

If the difference is 9,999 and the subtrahend is 1, the minuend is:

A student only marked the odd numbered pages of his notebook by using only odd numbers such as 1, 3, 5 etc. He used 93 digits. How many pages does the notebook have?

Find the sum of all odd numbers greater than 1 and smaller than 21

How many digits can we replace @ with, so that the four-digit number 20@0 would be smaller than 2018?

During a game of hide and seek, a child is looking for the other children who are hiding. The number of children who have been found is three times greater than the number of those who are still hidden. Which of the following numbers could NOT be the number of children playing hide and seek?

The distance from А to В is 2 dm greater than the distance from С to В.

A________________________________B_____________C

How many decimeters is the distance from А to В, if the distance from А to С is 1 m?

Four squirrels ate a total of 25 walnuts. Each squirrel ate at least one walnut. The first squirrel ate more than all the others. The second and third ate a total of 14 walnuts. How many walnuts did the fourth squirrel eat?

How many different sums of three different numbers between 1999 and 2004 are there?

The figures below are made of squares each with a side of 1 cm. They have been joined together to form a rectangle. How many cm is the perimeter of the rectangle?

I will release 1 insect in my aquarium every 20 minutes. If I have 12 insects and I have released the first one at 8 o’clock, what time will I release the last one?

Calculate 2017 + 200 – 199 + 198 – 197 + 196 – 195 + ... + 2 – 1

We have a rectangle with side lengths of 6 cm and 4 cm and a square with a perimeter that is equal to the perimeter of the rectangle. By how many sq. cm is the area of a rectangle smaller than the area of the square?