exam Maths Puzzle Numerical Ability

5y/14-8=5-2y/7

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Bob needs to buy 5 pounds of candy. one kind costs 1.75 per pound and the second kind costs 2.35 per pound. How much of each will he need if he spends 10.00? If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days? Can you show me how to work it out?