Question

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

Answer 1

let the number be ' x '

according to question ,

x + 4 × x = 80

x + 4x = 80

5x = 80

x = 80 /5

x = 16

therefore, the required number is 16.
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Your Answer : 16
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Answer 2

Define x:

Let the number be x

Form equation and solve x:

sum of a number and 4 times itself is 80

x + 4x = 80

5x = 80

x = 16

Answer: The number is 16.