Question

The difference between two numbers is 66. if one number is four times the other, find the numbers.

Answer 1

4x-x=66
3x=66
x=22
4x=4×22=88.
So the answer is 22 and 88.

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Answer 2

Let the smaller number=x
Then the other number=4x
You can get 
4x-x=66
3x=66
x=22 
4x=4×22=88. 
So the answer is 22 and 88.