arithmetic - in a secondary school the seats for maths physics and social studies are in the ratio 8 5 7 there is a proposal to increase these seats by 75 40 and 50 respectively what will be the new ratio - skillgun

Solution: Originally, let the number of seats for Maths, physics and social studies be 8x, 5x and 7x respectively.
Number of increased seats are (175% of 8x), (140% of 5x) and (150% of 7x).
i.e. (175*7x/100), (140*5x/100) and(150*7x/100) i.e. 14x, 7x and 21x/2.
.'. Required ratio = 14x : 7x : 21x/2 = 28x : 14x : 21x = 4 : 2 : 3