Arithmetichard · Past Paper
The ratio of two numbers is 3:4. If the LCM of the numbers is 180, what is the sum of the numbers?
A105
B90
C120
D84
✓ Correct Answer: A — 105
Let numbers be 3x, 4x. LCM(3x, 4x) = 12x. 12x = 180 => x = 15. Sum = 3x + 4x = 7x = 7 * 15 = 105.
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