exam Maths Puzzle Numerical Ability

Five hundred gallons of 82-octane gasoline is obtained by mixing 80-octane gasoline with 86-octane gasoline. How much of each must be used?

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exam Other Question

Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides --> 6

Help with this equation would be appreciated. Two points ,X and Y , are 120m apart , M is the mid-point of X and Y . An object travels from X to M in 12 seconds and then from M to Y at an average speed of 15m/s . Calculate :