Question
Priya's marks in Chemistry are 20% higher than her marks in Physics. The average of her marks in Chemistry, Physics, and Biology is 84. If she scored 87 in Biology, find her marks in Physics.
Solution
ATQ,
Total marks in Chemistry, Physics, and Biology = 84 × 3 = 252
Marks in Chemistry and Physics = 252 – 87 = 165
Let the marks in Physics be ‘x’.
Then marks in Chemistry = 1.2x
So, x + 1.2x = 165
2.2x = 165
x = 165 / 2.2
x = 75
So, marks in Physics = 75 marks
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