Question

the number of students in section a is 3 less than twice the number of students in section B in section a has 45 students if find the number of students in section B​

Answer 1

So let's assume girls to be 'x' and boys to be 'y' and adopt the simultaneous equation method to find out the answer to X and Y.

Firstly, let's us establish that: x + y = 45

Secondly, for every boy there are two girls. So,

2y = x.

We have the value for the 'x' here in the equation, so we will substitute that in the first equation:

2y + y = 45

3y = 45

y = 15

Boys are 15.

Put this answer into any of the equations now, we will the first one:

x + 15 = 45

x = 30