exam Maths Puzzle Numerical Ability

This is the question:
5/7 of a group of students are boys.
There are 18 more boys than girls.
How many students are there altogether.

I am having trouble setting up this equa

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exam Other Question

write an equation of the line that has given slope and y-intercept.

m=5,b= -3
what is the formula to find out why 100 over 3500 equals 3%?