book Maths Puzzle Numerical Ability

Sue has $3.50 of dimes and nickels. If she has 50 coins, how many of each type of coin does she have?

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A business class divided an imaginary investment of $80,000 among 3 mutual funds. The first fund grew by 10%, the second grew by 6% and the third grew by 15%. The total earnings a merchant wants to mix gummy worms worth $3 per pound and gummy bears worth $1.50 per pound to make 30 pounds of amixture worth $2.10 per pound. How many pounds of each type of ca