Need help with this equation

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Acarton of juice contains 64 ounces miss wilson bought six cartons of juice how many ounces of juice did she buy

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a diamond or heart. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability of randomly selecting a diamond or heart or club. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability of randomly selecting queen or club. (type an integer or a decimal rounded to three decimal places as needed.)