book Maths Puzzle Numerical Ability

Walter ia a waiter. he earns a daily wage of $50, plus tips that are equal to 15% of the total dinners he serves. what was the total cost of the dinners he served if he earned $170 on tuesday?

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book Other Question

Sammy has 4/9 of a share of stock. He gave 1/18 of what he had to each of his grandchildren. How many grandchildren does he have? (He gices away the entire 4/9 of the share of his stock). Graph the following equations
y=3over2x-2
3y=-2x+12