QUESTION: 2/5 of Tom's card is equal to 1/4 of Mary's cards. If Mary has 30 more cards than Tom, how many cards does Tom have?
2A) Tom spent 3/5 of her money on a rocking chair. If 1/4 of the remainder was $180, how much did she have at first?
2B) 2/5 of the students in a class are boys. 1/3 of the girls wore glasses and 4/7 of the boys did not wear glasses. If there were 12 boys who wore classes, find out how many girls did not wear glasses.
3) Repeated identity
Tom had 2/3 as many sweets as Mary. Ahmad had 1/4 as many sweets as Tom. If Ahmad had 30 fewer sweets than Mary, How many sweets did the three children have altogether?
4) Branching or Model
Tom spent $1500 of his salary on a laptop. He spent 1/3 of the remainder on food and saved the rest. If he saved 1/4 of his salary, How much was Tom's salary?