Heather spent 4 dollars on a storybook. She used half of the remaining money to buy 6 apples. She was left with 4 dollars after buying a hair clip that cost 2 dollars. How much did Heather have at first? 

John, Mike and Tom have 36 stamps altogether. If John gives Mike 5 stamps, Mike gives Tom 5 stamps, Tom gives John 2 stamps, then they have the same number of stamps. How many stamps does each of them have at first? 

There are 160 apples in two baskets A and B. Linda takes 10 apples from basket A to basket B, then takes 28 apples from basket B to basket A. Then two baskets have the same number of apples. How many apples are there in basket B at first?

Find A and B: 

Find A and B: 

Find A and B: 

Sally has a number of notebooks. She gives her sister 15 notebooks and her friend 12 notebooks and then uses a half of the remaining. There were 8 left. How many notebooks are there at first? Mà

A group of 9 students shared a box of pen. After they had taken 7 pens each, there were 6 pens left. How many pens were at first? 

At the bus stop, 7 passengers alighted from a bus and 17 passengers boarded it. There were 42 passengers on the bus after that. How many passengers were there on the bus at first? 

A fruit seller had 150 apples and 90 pears for sale. After selling some of them, he had 32 apples and 29 pears left. How many more apples than pears did he sell? 

There are a total of 420 books on the first and second shelves of a bookcase respectively. 60 books from the first shelf are transferred to the second one. 80 books are rearranged from the second shelf to the first one. The number of books on the two shelves become the same. How many books are on first shelf of bookcase at first? 

Mary had a basket of oranges. She took two oranges in the morning. Her family took half of the remaining after dinner. She took an orange the next morning.There were 5 oranges left in the basket. How many oranges were in the basket at first? 

Shane read 10 pages more than  half of a storybook on the first day. He read 10 pages more than half of the remaining pages on the second day. He had 20 pages more to go. How many pages had the storybook? 

Test the following numbers for divisibility by 3 and by 9.

Test the following numbers for divisibility by 4.