exam Maths Puzzle Numerical Ability

PROBLEM: THE QUANTITY y VARIES AS x AND INVERSELY AS z. IF y=15 WHEN x= 50 AND z= 10, FIND y WHEN x= 65 AND z= 5........

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Question 72 on page 63
Represent each quantity with a real number.
A country exported $60,000,000 less than it imported, creating a negative balance. Maria deposited $1200 in an account that paid 6 and 1/2 percent interest compounded continuously. How much money did she have in 8 years? (A, = Pe^rt)