Question

3/5 of the class are boys the no. of girls is 15 find the no. of boys​

Answer 1

Answer:

Here, we have given that total number of students in the class is 45.

And the part of boys in strength of class is \sf\frac{3}{5}

5

3

So, it's pretty simple to solve -

We will first find the number of boys:

\sf\frac{3}{5}\times45

5

3

×45

\sf=27\:boys=27boys

So, the number of girls in the class will be:

●Total number of students - Boys

\sf45-27=1845−27=18

So, total number of girls is 18 in school.

Answer 2

Answer:

Girls =

5

3

, Boys =(1−

5

3

)=

5

2

.

Fraction of students absent =

9

2

of

5

3

+

4

1

of

5

2

=

45

6

+

10

1

=

90

21

=

30

7

.

∴ Fraction of students present =(1−

30

7

)=

30

23

.