Question

find a number which when multiplied by 5 is increased by 80.

Answer 1

Let the number be a

According to question

5×a = a +80

=> 5a - a = 80

=> 4a = 80

=> a = 20

Required number = 20

Answer 2

Let the number be a

According to question

5×a = a +80

=> 5a - a = 80

=> 4a = 80

=> a = 20

Required number = 20