Question

Fiona was thinking of a number. Fiona doubles it and adds 5.1 to get an answer of 11.5.

what is the answer?

Answer 1

3•2

Explanation:

let X be the unknown number

X × 2 = 2x

2x + 5•1 = 11•5

2x = 11•5 - 5•1

2x = 6•4

divide both sides by 2

X = 3•2