exam Maths Puzzle Numerical Ability

How many pounds of coffee worth 1.44 a pound should be mixed with 20 pounds worth 1.80 a pound a mixture worth 1.56 a pound?

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exam Other Question

which of the following is equivalent to the rational number x-2/x+4
a. x^2+6x+8/x^2+4x+4
b. x^2+6x+8/x-4
c. x^2-4/x^2+6x+8
d. x^2+4x+4/x^2+6x+8
Please help me with this problem:
During 2006, the cash flows related to Dodge Data Inc's lending and borrowing activities are summarized as follows:
Cash lent to borrowers ....