Question

mn+mp=450 n+p=10 calculati m

Answer 1

$mn+mp=450 \\ \\ m(n+p)=450 \\ \\ m \cdot 10=450 \\ \\ m= \frac{450}{10} \\ \\ \boxed{m=45}$

Answer 2

m(n+p)=450 (factor comun )
m×10=450
m=450:10
m=45