The sum of a number and four, two times

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.

Add the fractions and simplify 1/2+ 1/3