Question

A number is decreased by 9 and the number obtain is multiplied by 7 to become 21 determine the number

Answer 1

let x be number

Given it is decreased by 9 and multiplied with 7 to get a result 21

(x-9)7 = 21

x =12 is ur answer

Answer 2

Answer:

Step-by-step explanation:

x-9

=3*7=21

x=12

because 12-9 =3

              3*7=21