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.