Question

ORO. 24 Q.2: 2) Shreya's marks in Mathematics were wrongly read as 70 instead of 90. What is the percentage error in the marks, O 200/9 100/9 6 2007 100/1​

Answer 1

Answer:

Let the marks in Math be x and in English (30−x).

New marks in Math =2+x

New marks in English =27−x

(2+x)(27−x)=210

54−2x+27x−x

2

=210

x

2

−25x+156=0

x

2

−12x−13x+156=0

x(x−12)−13(x−12)=0

(x−12)(x−13)=0

x=12,13

If her marks in Math is 12, then in English she got 18.

If math mark is 13, then she got 17 in English.