exam Maths Puzzle Numerical Ability

how many ounces of water must be added to 20 ounces of 8% salt solution to make 2% salt soltion

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exam Other Question

an engineer is required to report at station B every morning. at afixed time. when he left station A at 8:00 A.M and walked at 1.8 kph, he arrived at B, 5 minutes late. how far in km station B from station A? what is his appointment time at B. Find the center of the hyperbola:

x^2+2x-16y^2-15=0