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

Graph the solution set:
x+2y>-4
2x-y>2
Is there origin symmetry for the rational function f(x)=4x/6x^2+1?
a. yes
b. no