The ratio of two number a and b is 7 : 15, respectively. Their least c – McqOptions

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1.	The ratio of two number a and b is 7 : 15, respectively. Their least common multiple is 84. What is (b + a) : (b - a)?
A.	15 : 4
B.	11 : 4
C.	15 : 11
D.	7 : 11
Answer» C. 15 : 11

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