AFCAT II 2020 Solved Paper

Let weight of a and b are 3x and 5x respectively. then sum of their weight =8x
New weight of a=1.2(3x)=3.6x and new total weight =1.1(8x)=132
1.1(8x)=132⇒x=15
Now, old weight of b=5x=75kg
New weight of a=3.6×15=54kg
So new weight of b=132−54=78
Hence, percentage increment in weight of b=‌

78−75

75

×100=4%