exam Maths Puzzle Numerical Ability

The sum of two numbers is 51 and their difference is 13. Find each of the numbers.

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exam Other Question

Please help.
A zebra can run 15 mph faster than an elephant. A zebra can run 8 miles in the same time that an elephant can run 5 miles. Find the speed of each animal. What are the possible answers?
sin(x) - sin(3x) = 0