exam Maths Puzzle Numerical Ability

A helicopter used in fighting a forest fire travels at 175 km/h from the fire to a pond and 115 km/h with water from the pond to the fire. If a round-trip takes 30 minutes, how lon

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exam Other Question

A recently retired woman requires $6,000 per year in extra income. She has $50,000 to invest and can invest in B-rated bonds paying 15% per year or in a certifiicate of deposit (CD Solve by the addition method.
2x+4y=-2
3x-y=11