SOLUTION: A school has 585 pupils the number of girls is 29 more than the number of boys how many boys are there.thank you ma and sir

From the condition, you have these two equations

g + b = 585,   (1)   (g = # of girls, b = # of boys)
g - b =  29.   (2)

Add these equations (both the left and the right sides). You will get

2g = 585 + 29 = 614.

Hence, g =  = 312.  The number of girls is 312.
Can you find yourself the number of boys?

Let g = the number of girls. 
Then the number of boys is g - 29, and the sum, which is the number of pupils, is g + (g-29).

So, you have an equation

g + (g-29) = 585.

Simplify and solve it for g:

2g - 29 = 585,

2g = 585 + 29 = 614,

g =  = 312.

There are 312 girls.

And how many boys?

Number of boys: