Question

find x .

a.21.4
b. 15.1
c. 32.7
d. 29.2

Answer 1

So this is going to be using proportions, which in this case is going to be $\frac{18}{21} =\frac{25}{x}$

Firstly, cross-multiply to get $18x=525$

Next, just divide 18 on both sides, and your answer will be $x=29.2$ , or the last option.