Solve the following word problems by first writing an equation and then solving the equation a) John is twice as old as

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Solve the following word problems by first writing an equation and then solving the equation
a) John is twice as old as Mary. Five years ago he was three times as old. What is Mary's age now?
b) We are producing two products. We sell the first product at 1 dollar and the second product at 2 dollars. The sales of product 1 are doubled the sales of product 2. Our sales durian one day 10000 dollars. How many products of each type we sell per day
c) When opening her piggy bank, Mary noticed that she had 104 coins made up entirely of 20 cents and 5 cents coins that titalled exactly 10 dollars. How many of each each type coins did she have