anilnandyala wrote:
HOW MANY KGS OF TEA WORTH RS.25/KG MUST BE BLENDED WITH 30 KGS OF TEA WORTH RS.30/KG SO THAT BY SELLING THE BLENDED VARIETY AT RS.30/KG THERE SHOULD BE A GAIN OF 10%
A) 36
B) 40
C) 32
D) 42
E) 45
the wording is very confusing, what is RS???
my approach...
suppose we have 40 kgs of tea which costs 0.25$/kg
total revenue - 10$
we have 30kgs of tea which costs 0.3$/kg
total revenue - 9$
total - 19$
19 = 100%
1.9 = 10%
total new revenue = 20.9 must be.
40+30 = 70. 70*0.3 = 21 - too big. need a smaller number - B, D, and E are out.
since the difference is not that big (0.1$ only), we should look for a number that is slightly less than 40.
we are left with A and C...one more testing to do...
let's take A
36*0.25 = 9$
30*0.3 = 9$
total = 18$
+10% = 19.8$
now..36+30 = 66.
66*0.3 = 19.8$ - we have a match...
A must be the answer.