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Ramesh Bodduri

· started a discussion

· 1 Months ago

By allegation method
-6 +15

+9

(15-9) (9-(-6))
=6 =15
6:15 = 2:5 so B/W TVS 2/7 * 315 = 90 TVS

Question:
A trader sells total 315 TV sets. He sells black and white TV  sets at a loss of 6% and colour TV sets at a profit of 15%. Thus he gains 9% on the whole. The no. of B/W TV sets, which he has sold, is:
Options:
A) 126
B) 216
C) 90
D) Can’t be determined
E) None of these
Solution:

Lets assume BW=x , colour=315-x (consider 1 rs PC per tv)

x{(100-6)/100}+(315-x){(100+15)/100} = 315+315*(9/100)

=> x=90

kanhaiya jha

· commented

· 1 Months ago

Price also required

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