book Maths Puzzle Numerical Ability

You have $32 to spend on supplies for your science fair project. If you buy two plants for expirements, you will have $18 left for other supplies. How much is each plant?

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seven times a number is the same as 12 more than 3 times the number. Find the number. we have to write an equation plus solve it. Don has 80 coins. He has 4 times as many dimes as nickels and the remaining are pennies. With a single variable, express the number.