exam Maths Puzzle Numerical Ability

Light travels through space at a constant speed of about 3*10^5 km/s. Sunlight reflecting from the moon takes about 1.28*10^0s to reach Earth. Find the distance from the moon to the Earth.

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exam Other Question

You have 40 gallons of 20% solution. How Much 8% soultion do you need to add to get some 12% solution? How much solution will you have then? Factor the following trinomial completely.
2a^3 - 52a^2b + 96ab^2