exam Maths Puzzle Numerical Ability

Billy has two-thirds as many marbles as Tommy. Jimmy has three-eighths as many marbles as Billy. Together Jimmy and Billy have eight fewer marbles than Tommy. How many marbles does each boy have?

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exam Other Question

Add 3c^2 + 7c + 1 and 10c^2 - 8c - 4. Add or subtract the fractions then simplify using the Pythagorean identities and factoring to find the expression that completes the identity.

sinx/(cosx+1) + (cosx+1)/sin x

Please show me the steps. Thank you!