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Abhay Sinha

· started a discussion

· 1 Months ago

Error of solution (Question:321061.0)

Most of the solutions are wrong, correct it otherwise I will take another mock test

Question:

    Numbers of students in three batches P, Q, R in a school were in ratio 3:5:4 in the last year. This year the numbers increased by certain percentage to change the ratio 18:35:25. If percentage increase in class C was 25%.

What is the percentage increase in class B and A


Options:
A)

 25%, 50%

B)

 10%, 20%

C)

 14%, 28%

D)

 20%, 40%

Solution:

    Let the numbers of students in last year =  3x, 5x    and  4x   

Now this year numbers of students =  18y, 35y    and  25y   

ACQ  4x×54=25y⇒x=5y   

Class Batch A  ⇒(3x)P100=18y   

⇒3x(P)2100=18×x5⇒P=120   

So numbers of students in batch A will be increased by 20%

And now in batch B

(5x)P100=35y(5x)P100=7xP=140   

So no. of students Batch B increased by = 40%

Nitin Dubey

· commented

· 1 Months ago

Gaand maar di h inhone...St aur mood dono jhantu kr rkha h
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