What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Replace the question mark with the correct number in below Picture:

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

John needs to purchase 100 chocolates from three different shops and he has exactly 100 rupees to do that which he must spend entirely. He must buy at least 1 Chocolate from each shop.

The first shop is selling each chocolate at 5 paise, the second is selling at 1 rupee and the third is selling at 5 rupees.

How many chocolates should he buy from each shop?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Our product and our sum always give the same answer. Who are we?