book Maths Puzzle Numerical Ability

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It is approximately 480 miles from Los Angeles, California, to San Francisco, California. Allowing for various traffic conditions, a driver can

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1 Eliminate, x,y between the following equations
x^2-y^2=px-qy, 4xy=qx+py , x^2+y^2=1

2. Eliminate, x,y,z between equations
y/z - z/y = a , z/x -x/z = b , x/y - y/x =c Jerry deposited $160 at the bank in one-dollar and five-dollars bills.He deposited three times as many one-dollar bills as five-dollars bills did Jerry deposit at the bank?