book Maths Puzzle Numerical Ability

Carlos scored 15 more points than John in the baseball game. If the product if the two point totals is 154, how many points did each boy score?

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book Other Question

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. 5x^-15x^3-25x-10 need to find out how to set this problem?