exam Maths Puzzle Numerical Ability

Five pencils and three erasers cost 65 cents. Three pencils and two erasers cost 40 cents. Find the cost of one pencil and one eraser.

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exam Other Question

One grocery clerk can stock a shelf in 20 minutes, whereas a second clerk requires 30 minutes to stock the same shelf. If the two clerks worked together, how long would it take them to stock the shelf ? Is (√x^2)= x an identity (true for all nonnegative values of x)?