The ratio of two number a and b is 7 : 15, respectively. The - Exam Yatra

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IB ACIO Grade II Previous Paper 5 (Held on: 18 Feb 2021 Shift 1)
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The ratio of two number a and b is 7 : 15, respectively. Their least common multiple is 84. What is (b + a) : (b - a)?

[IB ACIO Grade II Previous Paper 5 (Held on: 18 Feb 2021 Shift 1)]

A

15 : 4

B

11 : 4

C

15 : 11

D

7 : 11

EXPLANATION

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