b - [b -(a+b) - {b - (b - a+b)} + 2a] = ?
6a
4a
a
-2a
Explanation:
b - [b -(a+b) - {b - (b - a+b)} + 2a]
= b - [b -a -b - {b -b +a -b} + 2a]
= b - [b -a -b - {a -b} + 2a]
= b - [b -a -b - a +b + 2a]
= b - [b]
= b - b
= 0
Next Question
A man has Rs. 480 in the denominations of one-rupee notes, five-rupee notes and ten-rupee notes. The number of notes of each denomination is equal. What is the total number of notes that he has ?