Anyone wanna have sexxx

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read

The quotient of 15 and a number is 1 over 3 written as an equation