exam Maths Puzzle Numerical Ability

warren has 40 coins(all nickels dimes and quarters) worth 4.05. he has 7 more nickels than dimes. how many quarters does warren have?

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exam Other Question

Find the GCF of each product.
(6y^2 - 3y)(y + 7)
A line contains the points C (4 1/2, -3) and D (6 1/2, 6) What is the slpe of all lines perpendicular to CD?