Question

What is to be subtracted from 13 to get
5.4

Answer 1

$suppose \: the \: number \: be \: x \\ 13 - x = 5.4 \\ - x = 5.4 - 13 \\ - x = - 7.6 \\ x = 7.6$

Answer 2

Let the number be x.=

13 - × = 5.4

-× = 13 - 5.4
× = 7.6

therefore 7.6 is the answer.