book Maths Puzzle Numerical Ability

I have four 3 cent stamps and three 5 cent stamps. Using one or more of these stamps, how many different amounts of postage can I make?

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book Other Question

what is the formula to calculate 52 dimes and nickels to equate $4.50? translate to a system of equations and solve.

the sum of two numbers is 30. their difference is 40. find the numbers.