Orbital period of Halley's comet is ___ years.

A balloon is connected to a meteorological station by a cable of length 130 m, inclined at 60 deg to the horizontal. Find the height of the balloon from the ground. Assume that there is no slack in cable.

Mother of K's father is the sister of G. S is the daughter of G. How is S related to K's father?

Given that (a2 + b2) = 60, then find the value of (a + b)2 + (a - b)2 ?

Which one reveals, more appropriately, functioning of the heart?

In a factory, 60 workers can stitch 120 m of clothes in 7 days, what length of clothes can be stitched by 70 workers in 5 days?

Who is number 1 in the Forbes 2016 ranking of World's billionaires?

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