book Maths Puzzle Numerical Ability

a friend has trouble simplifing 20-(-38).Explain how to solve this problem

Read Solution (Total 0)

book Other Question

Where on the graph of 3x-y = 12 are the x and y coordinates opposites of each other?
I started out by y = mx + b and changed the equation to y = 3x - 12 but i am stuck from there Pablo is driving 40 miles per house. After he has driven 30 miles, his brother Ricardo starts driving in the same direction. At what rate must Ricardo drive to catch up with Pablo