exam Maths Puzzle Numerical Ability

i would really appreciate if you would help me with problem number 22, on page 322.

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exam Other Question

An 80 page newspaper is in one section. The sheet with page 11 on it is missing. What other pages are missing? A coin collection consisting of nickels, quarters, and half dollars is worth $10.00 There are 6 times as many nickels as quarters and 1 less half dollars than quarters. Find the number of nickels, quarters, and half dollars.