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If a:b = 2:3 and b:c = 4:5, then a:c equals:
A8:15
B10:15
C6:15
D8:10
Answer & Solution
Correct answer: A. 8:15
1. Make b common: scale a:b 2:3 → 8:12 (×4); scale b:c 4:5 → 12:15 (×3).
2. Now a:b:c = 8:12:15, so a:c = 8:15.
3. Therefore 8:15.
_Source: KMAT Karnataka 2022 PYQ Q.57_