If a:b = 5:7 and b:c = 3:4, then a:b:c = ?
Show answer & explanation
Correct answer: A
Explanation
Given:
a : b = 5 : 7
b : c = 3 : 4
Combine the ratios by forming like terms
a : b = 5 : 7 × 3 = 15 : 21
b : c = 3 : 4 × 7 = 21 : 28
a : b : c = 15 : 21 : 28