How do I solve this word problem?

Suppose a bag contains at total of 5280 quarters; some of which are Canadian and some of which are US. The Canadian dollar is worth 87 US cents. An ounce of gold is worth US$ 989.
a) If the number of US coins the bag contains is N, write an algebraic expression for how many US dollars they are worth.
b) Write an expression for how many ounces of gold the US coins will buy.
c) Write an expression in terms of N (the number of US coins) for the number of Canadian coins in the bag.
d) Give an expression (in terms of N, the number of US coins) for how many US dollars the Canadian coins are worth.
e) Write an expression (in terms of only the variable N, the number of US coins) for how many ounces of gold the Canadian coins will buy.
f) Write, and then simplify (by collecting like terms, etc.), an expression, in which N (the number of US coins) is the only variable, for the amount of gold that the whole bag will buy.

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