Question

A=42/24(ORI)X/35
X∈N*
A∈N

Answer 1

[tex]A=\frac{42}{24}\cdot\frac{X}{15}=\frac{7}{3}\cdot\frac{X}{35}=\frac{X}{15}\in \mathbb{N}\\ \Rightarrow X\in M^*_{15}=\{15,30,45,60,...\}\\ A\in\mathbb{N^*}[/tex]