Question

If the sum of a decimal number and 6.2 is multiplied by 3 ,the result is the same as 9 times the decimal number decreased by 2.4 . What is the number?

Answer 1

Answer: 6.7

Step-by-step explanation:

let the missing decimal number be x.

so the equation formed will be 3(x+6.2) = 9(x-2.4)

by solving this equation,

3(x+6.2) = 9(x-2.4)

3x+18.6 = 9x-21.6

9x-3x=21.6+18.6

6x=40.2

x=40.2/6

x=6.7

verification:

3(x+6.2) = 9(x-2.4)

3(6.7+6.2)=9(6.7-2.4)

3(12.9)=9(4.3)

38.7=38.7