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Solve the following problems using two v...

Solve the following problems using two variables:
`(i)` The sum of two numbers is `97`. If the greater number is divide by the smaller, the quotient is `7` and the remainder is `1`. Find the numbers.
`(ii)` The sum of the present ages of mother and her daughter is `50` years. After `20` years mother's age will be twice her daughter's age at that time. Find their present ages.
`(iii)` The sum of a two-digit number and the number obtained by interchanging the digit is `121`. The digit at the units place is `7` more than the digit at the tens place. Find the number.
`(iv)` Vedant can row down stream `24km` in `2` hours and upstream `8km` in `2` hours . Find his speed of rowing in still water and the speed of the water current.

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