Question

The sum of a number and 4 times itself is 80. What is the number​

Answer 1

4x+x=80

5x=80

x=80/5

x=16

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Answer 2

Solution-

Let the number be x.

4 times the number = 4x.

Sum = 80

According to condition,

x + 4x = 80

or, 5x = 80

or, x = 80/5

or, x = 16

Hence, the number is 16.

Verify-

x + 4x = 80

or, 16 + (4×16) = 80

or, 16 + 64 = 60

or, 80 = 80

Hence, L.H.S = R.H.S.

Hope this helps you to get to your answer.