Question

Find the number if 2 1/2 of it is 15
(please help)

Answer 1

$2.5x = 15$

$x = \frac{15}{2.5} = 6$

Answer 2

Answer:

or Also

$\frac{5}{2} x = 15 \\ 5x = 15 \times 2 \\ 5x = 30 \\ 5x \div 5 = 30 \div 5 \\ x = 6$