The ratio of two number a and b is 7 : 15, respectively. Their least common multiple is 84. What is (b + a) : (b - a)?
1
15 : 4
2
11 : 4
3
15 : 11
4
7 : 11
The ratio of two number a and b is 7 : 15, respectively. Their least common multiple is 84. What is (b + a) : (b - a)?