STD. VI -- exercise on word problems in simple equation

There are two numbers, one of which is 7 times as great as the other, if the sum of the numbers is 96, then find the numbers?

Divide 70 into two parts so that one may be four times the other.

One number is 16 times as great as another, and their difference is 75, find them.

Find two numbers differing by 57 so that one of them is 20 times the other.

Find two numbers whose sum is 52, such that one of them is one twelfth of the other.

Find two numbers differing by 88 so that one of them is one ninth of the other.

Find the sum of three numbers whose sum is 56, such that the second number is twice the first number and the third number equals to four times the first.

Divide 84 into three parts, such that two of the parts are equal and the third part is five times as great as either of the equal parts.

Having thought of a number I multiplied it successively by 4, 5 and 8 and added the result. I then subtract the double of the number thought of and find that the result comes to 45. What number did I think of?