Question

a number is substracted from 2/5 and the difference is multiplied by 10 the result is -16 find the number

Answer 1

let the number be x
given that
x-2÷5=5x-2÷5
5x-2÷5×10=-16
5x-2=-8
5x=-6
x=-6/5

Answer 2

[2/5-x]10=-16

2/5-x=-16/10

-x=-[4/10+16/10]

-x=-[20/10]

-x=-2

x=2