Question

The number of girls in the school is 57 less than 2 times the number of boys in the school. There are 143 girls in the school. How many boys are in the school?

Answer 1

Let x= number of boys
So 2x - 57 is the number of girls

If there are 143 girls;

2x - 57 = 143; add 57 to both sides;
2x = 200 divide by 2 to solve for x;
x = 100, the number of boys in the school

Check: does 2(100) - 57 = 143, and the answer is yes