book Maths Puzzle Numerical Ability

a=11 B=? C=61

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book Other Question

on the coordinate line L contains points (-3,-4)and(9,2)

What is the slope of line L? Show or explain your answer.
A store advertises an air conditioner on sale for $280. If this is marked down 20%, what was the original price.

Again I tried to use a proportion or multiply 20% x 280 and I do not get the answer in my book. Please help me.