exam Maths Puzzle Numerical Ability

A projectile is launched upward at an initial velocity of 64 ft/sec from a platform. It took 8 sec to hit ground. How tall was the platform?

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exam Other Question
A number between 300 and 400 is forty times the sum of its digits. The tens digit is 6 more than the units digit. Find the number. (3x -9)/(4x +20) . (x² +3x -10)/(6x² -12x)