Prove the following statement "For Elevations which exceed or fall short of `45^@` by equal amounts the ranges are equal.

Express the following statements by equations : A man distributed his savings equally among his four sons and each son received Rs. 300.

Express the following statements by equations : While purchasing a bicycle, 500/- was paid in cash and the remaining amount was paid in four equal instalment. A total of 900/- is thus paid.

Express the following statements by equations : The perimeter of a rectangle is 40 metres and its length exceeds 5 times of its breadth by 2 metres.