book Maths Puzzle Numerical Ability

Suppose Jodi invested $10,000, part at 6% simple annual interest, and the rest at 9% simple annual interest. If you received $684 in simple interest after one year, how much did y

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RE: permutations & combinations
(Bostock & Chandler "Pure Mathematics", Exercise 15e, question 12)

A box contains 10 bricks identical except for colour.
3 red, 2 white, 2 ye If the revenue function for a rib place is r(x)33/16x-42 and the cost function is c(x)=33/32x+47, how much profit or loss will be made each hour when 95 dinners are produced and so