Question

The total number of pupils in three classes of
a school is 905. The number of pupils in
classes I and II are in the ratio 3:7 and those
in classes II and Ill are in the ratio 9: 13.
What is the count of pupils in the class that
had the highest number of pupils?​

Answer 1

Explanation:

number of pupils in three classes of

a school is 905.

Answer 2

Answer:

Number of pupils in 3rd class = 455

Explanation:

Given:

Number of student in school = 905

Ratio in class 1 and 2 = 3:7

Ratio in class 2 and 3 = 9:13

Find:

Highest number of pupils?​

Computation:

Ratio in class 1 and 2 = 3:7    × 9

Ratio in class 2 and 3 = 9:13      × 7

Ratio in class 1 and 2 = 27:63  ........Point 1

Ratio in class 2 and 3 = 63:91  ......... Point 2

From point 1 and 2

Ratio in class 1 and 2 and 3 = 27:63:91

So,

Class 3 had the highest number of pupils

Number of pupils in 3rd class = 905 × 91/(27+63+91)

Number of pupils in 3rd class = 905 × 91/(181)

Number of pupils in 3rd class = 455