# If 4a=5b and 7b=9c, then a:b:c=?

- 46:36:28
- 44:33:28
- 45 : 36 : 28
- 36:28:45

**Answer: (3) 45 : 36 : 28**

**Explanation:-**

4 a = 5 b and 7 b = 9 c

Then, a = 5 b/4 and b = 9 c/7

a/b = 5/4 and b/c = 9/7

a : b = 5 : 4 and b : c = 9 : 7

**Formula:-**

**A : B = a : b & B : C + b : c**

**Then, A : B : C = a x b : b x b : b x c**

Then, a : b = 5 : 4 and b : c = 9 : 7

a : b : c = 5 x 9 : 4 x 9 : 4 x 7

= 45 : 36 : 28

Then, the value of a : b : c = 45 : 36 : 28

Hence, the answer is (3) 45 : 36 : 28.