exam Maths Puzzle Numerical Ability

The set of positive real numbers is closed under which operation(s)? Select all that apply.

a. Multiplication
b. Division
c. Addition
d. Subtraction

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exam Other Question

A gourmet food shop mixes nuts selling at $16/lb with fruit selling at $3/lb. They want a mixture of 7lbs to sell at $12/lb. How many pounds of each should they use? I cant figure out how to solve the problem X2 + 9x + 3 = 0.
I was told i need to use the quadratic formula though. Any help would be greatly appreciated.