exam Maths Puzzle Numerical Ability

Barbara wants to leave a 15% tip on a bill of $82.50. Explain how she can figure this tip by estimation.

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exam Other Question

Solve the formula for the specified variable.
P = s1 + s2 + s3 for s3 Two malts and two sodas cost $1.30. three malts and one soda cost $1.45. Find the cost of one malt and one soda.