exam Maths Puzzle Numerical Ability

A tree diagram shows the possibilites for boys and girls in a two-child family. If a family has 2 children, what are the chances that one child is a girl and one child is a boy?

A 1/4
B 1/3
C 1/2
D 3/4

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exam Other Question
I am trying to solve this inequality. 3(1-2x)/4 - (1/2)x is less than 1. I dont know what to do with the equation because of the 2 fractions. graph all on a graph;
f(x)=log3x+2
f(x)=log3(x+2)
f(x)=log3(x-2)
f(x)=log3x