Question

A book of 20 postage stamps contains only 17 cents and 22 cents stamps. The total value of the stamps is $4. There are no stamps at 22 cents.

(i) Write an expression, in terms of n, for the total value of the cent stamps.

(ii) Write an expression, in terms of n for the number of 17 cent stamps.

(iii) The number of 22 cent stamps, n, can be found by solving the equation: 22n + 17(20 – n) = 400

How many 22 cent stamps are in the book?

Answer 1

Answer:

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