2/5 = 8/n
Cross multiply:
2 *n = 5 *8
2n = 40
Divide both sides by 2:
n = 40 / 2
n = 20
n = 20
One way is to use the method of ' cross multiplication '
[tex]\frac{a}{b}[/tex] = [tex]\frac{c}{d}[/tex] ⇒ ad = bc
Hence 2n = 8 × 5 = 40
divide both sides by 2
n = [tex]\frac{40}{2}[/tex] = 20
