book Maths Puzzle Numerical Ability

Working together, Sarah and Heidi can milk the cows in 3 hours. If they worked alone, it would take Heidi 1 hour longer to milk the cows than it would take Sarah. How long would it

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book Other Question

A magnetic head has worn down to the chord line AB measuring .250 inch. If the orginal gap depth is .125 inch how much useful head life remains ? What happens to the inequalities when you do the following to each side of an inequalities?

subtract anegtive number