Question

in a school 3_5 of the children are boys and the number of girls is 800 .the number of boys is _​

Answer 1

Answer:

The number of boys is 1200.

Step-by-step explanation:

Let number of student in the school =x

In a school $\frac{3}{5}$ of the children are boys

Fraction of girls in the school=

                                                $1-fraction of boy\\ \\ 1-\frac{3}{5} \\ \\ \frac{5-3}{5} =\frac{2}{5}$

The number of girls is 800.

                                      $\frac{2}{5} x=800\\ \\ 2x=4000\\ \\ x=2000$

Number of boys=

                                       $\frac{3}{5} x=\frac{3}{5}(2000)\\ =3 \cdot 400=1200$