If 3a = 5b = 90, then ab =

Question

(A) 60

(B) 270

(C) 420

(D) 540

(E) 775

Archit3110 · Answer

3a = 5b = 90
a= 30 and b = 18
ab = 540
option D

logro · Answer

Given that 3a=5b=90

(1) 3a=90 which implies a=30
(2) 5b=90 which implies b=18

ab = 18*30 = 540

Hence the OA is D

Posted from my mobile device

daniformic · Answer

b=18
a=30
a*b=540

Answer->D

rajatchopra1994 · Answer

Explanation:
3a = 5b = 90
3a = 90
a = 30

5b = 90
b = 18

ab = 30*18
=540

IMO-D

Posted from my mobile device

VERBAL1 · Answer

5 secs to ans this:

3a=90 
a =90/3
a=30

5b=90 
b=90/5
b=18
ab = 18*30 = 540

OA : D

MathRevolution · Answer

3a = 5b = 90

=> 3a = 90 => a = 30
=> 5b = 90 => b = 18

=> ab = 30 * 18 = 540

Answer D

ScottTargetTestPrep · Answer

Solution:
 
We see that a = 90/3 = 30 and b = 90/5 = 18. Therefore, ab = 30 x 18 = 540.

Answer: D

Prep Toolkit