10:5 = 15:N
You asked:
Solve \(10 : 5=15 : N\) for the variable \(N\).
MathBot Answer:
$$\begin{aligned}N &= \frac{15}{2}\end{aligned}$$
Express both ratios as fractions. \[\frac{10}{5} = \frac{15}{N}\]
Cross-multiply and solve for the unknown. $$\begin{aligned}\frac{10}{5} &= \frac{15}{N} \\ 10 N &= 75 \\ N &&= \frac{15}{2} \end{aligned}$$