Correct Answer:
A. 224
Correct answer: 224. In a proportion, 7 × x = 8 × 196, so x = 1568 ÷ 7 = 224.
Background: In a : b :: c : d, we have a × d = b × c.
- 226: 226 does not satisfy the proportion.
- 228: 228 does not satisfy the proportion.
- 232: 232 does not satisfy the proportion.
Did you know? 196 ÷ 7 = 28, and 8 × 28 = 224.
Memory trick: Cross-multiply.