Answer:

3

Step-By-Step Explanation:

Since

X : 4 = 15 : 20

Then we know

X/4 = 15/20

Multiplying both sides by 4 cancels on the left

4 × (X/4) = (15/20) × 4

X = (15/20) × 4

Then solving for X

X = 4 × (15/20)

X = 3

Therefore

3 : 4 = 15 : 20

#CarryOnLearning ^‿^

Answer:

A. 3

Step-by-step explanation:

Find the least common multiple of the denominators.

4 — 4, 8, 12, 16, 20

20 — 20, 40

LCM is 20

This means 5n is equal to 15

Divide both sides by 5