plz solve these questions and also xplain d solution...THanks in advance

Q.1 Ali is 67.His son rehan is 29.In How many years will rehan be exactly half his father’s age?

Q.2 Of d 20 ppl who won prize money, 7 have come forward to claim their winnings. what percent of the ppl have not yet appeared?

Q.3 If the result obtained by multiplying a num, x, by a num 1 less than itself is 4 less than multiplying x by itself, then x=?

Q.4 If 3m<48 and 2m>24 than m will be equal to?

Q.5 what single discount is equivalent to two successive discounts of 10% and 15%?

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