Question

1. select all ratios equivalent to 30:15.

24:12
13:5
21:9
11:3

Explanation:

Step1: Simplify the base ratio

Reduce $30:15$ by dividing both terms by their greatest common divisor (15):
$\frac{30}{15}:\frac{15}{15} = 2:1$

Step2: Simplify 24:12

Divide both terms by 12:
$\frac{24}{12}:\frac{12}{12} = 2:1$

Step3: Simplify 13:5

This ratio is already in simplest form, as 13 and 5 share no common divisor other than 1:
$13:5
eq 2:1$

Step4: Simplify 21:9

Divide both terms by 3:
$\frac{21}{3}:\frac{9}{3} = 7:3
eq 2:1$

Step5: Simplify 11:3

This ratio is already in simplest form, as 11 and 3 share no common divisor other than 1:
$11:3
eq 2:1$

Answer:

24:12