Question

4. The marks of three students P.Q and R of a class are in the ratio 19:16:20. The marks of students P, Q and Rare increased by 75%, 20% and 30%
respectively. The total marks of students increased by?​

Answer 1

STEP:- 1

75/100×100+20/100×100+30/100×100

= 3/4×100+1/5×100+3/10×100

= 75+20+30

= 95+30

= 125

STEP:- 2

= 19x+16x+20x=125

= 55x=125

= x=125/55

= x=25/11

STEP:- 3

= 19x=19×25/11

=475/11

= 16x=16×25/11

=400/11

= 20x=20×25/11

=500/11