exam Maths Puzzle Numerical Ability

how do I work this problem out? Solve for x: 4/x=1/5

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Science and medicine. The equation h = -16t^2 + 112t gives teh height of an arrow, shot upward from the ground with an initial velocity of 112 ft/s, where t is the time after the a Triangle ABC is isosceles with AC=BC; BD is the medion to side AC...

If DB is 2 cm greater than DC and the peremiter of triangle BDC is 70 cm, find BC.

We are supposed to be