Level 2
There were 1168 more red marbles than green marbles in a box. Another 376 red marbles and 572 green marbles were put into the box. How many more red marbles than green marbles were there in the box?
Level 3
Three boys collected 220 stamps altogether. Jake collected 4 times as many stamps as Ken. Ben collected 35 stamps. How many stamps did Ken collect?
Level 3
There were twice as many children as boys and thrice as many girls as boys at a carnival. Given that there were a total of 360 children at the carnival, how many girls were at the carnival?
Level 3
The total heights of three ostriches is 1225 cm. Ostrich A is twice as tall as Ostrich B. Ostrich C is twice as tall as Ostrich A. What is the height of Ostrich C?