GATE Electrical Engineering (EE) 2018 Solved Paper

Assume total number of marbles = 100
Blue marble =40
Black marble =25
Red marble =20
Yellow marble =15
Cost of 1 marble be Rs. 1
Cost of marbles increased =25%
New cost of 1 marble = Rs. 1.25
Let x marbles are reduced from each type but the total cost must remain same i.e. Rs 100
Now,
125−5x=100
25=5x
x=5
So, now the numbers of different marbles are
Blue marble =35
Black marble =20
Red marble =15
Yellow marble =10
% blue marbles in new design =‌

35

80

×100=43.75%