Bunuel wrote:

A man sold only red and blue balloons on only small and large sizes. If he sold a total of 108 balloons, how many were small red balloons?

(1) He sold 35 large balloons

(2) He sold 25 small blue balloons

Given small red+ small blue +large red+ large blue = 108

we have to find out number of small red.

Statement 1: 35 large balloon sold

large red + large blue = 35

Small red + small blue + 35 = 108

Small red + small blue = 73.

There are 2 variable and one equation so statement 1 is not sufficient.

Statement 2 : small blue = 25

As we have to find the number of small red balloon, this statement does not give information about small red balloon's number.

So it is insufficient

Combining Statement 1 and 2 , i.e Small red + small blue = 73;small blue = 25 , we can find out the number of small red balloon.

small red+ 25 = 73

small red = 48

So answer is C

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