Algebra
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Q.

Naveen purchased two oranges, 3 apples and 5 bananas and paid Rs 40. Had Naveen purchased 3 oranges, 5 apples and 9 bananas, He would have to pay Rs 64. Gagan demanded only 1 orange, 1 apple and 1 banana. If Naveen purchased only what was demanded by Gagan, then how much would he have paid (in Rs)?

 A.

16

 B.

28

 C.

36

 D.

24

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Solution:
Option(A) is correct

Let the cost of each orange, apple and banana be $o, a$ and $b$ respectively.
Given, 

$2(o)+3a+5b=40$ -------- (i)

$3(o)+5a+9b=64$-------- (ii)

From 2(i) - (ii):

$⇒ o+a+b=16$


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