GMAT prep Ratio question

suketsinha · Posted: Fri Aug 31, 2007 6:20 pm Post subject: GMAT prep Ratio question

Can anybody help me how this is solved:
At a certain company , the average work experience of male employees is 9.8, while that of female emploees is 9.1. What is ratio of number of males to number of females in the company
1) 52 males in the company
2) average work experience of males and females combined is 9.3

Answer is B.

Bharat · Posted: Fri Aug 31, 2007 9:26 pm Post subject:

Let me know in case of errors.
1. to know the number of mails is not sufficient we can only calculate the total number of experience years using this information but nothing about the number of females. NOT SUFFICIENT
2. write it this way:
(9.8*M + 9.1*F)/(M+F) = 9.3 [M: number of males, & F: number of females]
solvng this will provide the desired ratio.
SUFFICIENT

Hence B is the answer.

(Note that using 1 & 2 together you can calculate the number of females in the company)