exam Maths Puzzle Numerical Ability

I need help with this word problem:

If you stand in shallow water and look at an object below the surface of the water, the object will look farther away from you than it really

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exam Other Question

One leg of a right triangle is 2 inches smaller than the hypotenuse. The other leg is 5 inches long. What are the lengths of the unknown leg and hypotenuse? Diameter AB of circle O is 21 inches. Line AB is extended through B to a point C, and tangent Line CD is drawn, meeting the circle at D. CD is 6 inches longer than BC.

a) Let x represent BC. Express CD and CA in terms of x

b) Find BC