Step-by-step explanation:
Rewrite ratio into fraction
[tex] \frac{n}{30} = \frac{1}{2} [/tex]
Cross multiply
2n = (1)(30)
2n = 30
divide each side by 2
[tex] \frac{2n}{2} = \frac{30}{2} [/tex]
n = 15
Check by:
subsitute n = 15 in the given
[tex] \frac{15}{30} = \frac{1}{2} [/tex]
Cross multiply
(15)(2) = (1)(30)
30 = 30 ✓
