Level 2
In a conference, there were 651 females and 97 males. How many males must join in order for the number of males to be twice that of the number of females?
Level 3
Anna and Jenny had the same number of stickers. After Anna had given away 65 stickers, Jenny had 6 times as many stickers as Anna. How many stickers did each of them have at first?
Level 3
Emily collected 4 times as many coins as Tim. After Tim had collected another 135 coins, both of them had an equal number of old coins. How many old coins did Emily collected?
Level 3
Steven and Ting Ting shared 400 cubes equally. After Steven gave away some cubes, Ting Ting has 8 times as many cubes as Steven. How many cubes did Steven give away?
Level 3
Girly has twice as many shells as Joana. After Joana has bought another 150 shells, Joana has twice as many shells as Girly. How many shells does Joana have at first?
Level 3
Amelia had twice as many hair clips as Betty. After Betty had bought another 90 hair clips, Betty had 3 times as many hair clips as Amelia. How many hair clips did Amelia have?
Level 3
Jonas had 3 times as many cards as Dave. After Dave bought another 120 cards, Jonas had twice as many cards as Dave. How many cards did the two boys have altogether in the end?
