Percentage Change. 1. Find the percentage increase in area if the length of a square is increased by 20%

Transcription

1 Percentage Change 1. Find the percentage increase in area if the length of a square is increased by 20% 2. Container A and B contain some gold ores. If 46.5kg of gold ores are removed from Container A, the mass of the gold ores in Container A is 60% that of the mass of the gold ores in Container B. If 35.2kg of gold ores are removed from Container B, the mass of the gold ores in Container B will be 85% that of the mass of the gold ores in Container A. What is the total mass of gold ores in Container A and B?

2 3. Ali had 40% more yellow balloon than black balloons. He bought 60% more yellow balloons to make a balloon giraffe sculpture. He used 25% of the yellow balloons. In the end, he had 340 more yellow balloons than black balloons. How many balloons did Ali have in the end? 4. Shane had 60% more chocolate cookies than Faith. Sue had 35% less chocolate cookies than Shane. Shane and Faith gave Sue some chocolate cookies in the ratio of 3:1. As a result, Sue had 1 1 times as many chocolate cookies as before. Given that Shane had more chocolate cookies than Faith in the end. How many chocolate cookies did Shane give to Sue? 1 2

3 5. Pete had 60% as many books as Roy. Pete gave away 20% of his books and Roy bought another 46 books. Pete now has 25% as many books as Roy. Find the number of books Pete had at first. 6. Kai Xiang and Lynn played a game using peanuts. At first, 25% of the number of peanuts Kai Xiang had was 1 of the number of peanuts Lynn had. 3 In the first round, Kai Xiang lost 65 of her peanuts to Lynn. In the second round, Lynn lost 30 of her peanuts to Kai Xiang. After the game they had the same number of peanuts. (a) How many peanuts did Kai Xiang have at first? (b) How many peanuts did Lynn have in the end? Ans :a) b)

4 7. In a workshop, each participant needs to pay $25 to attend the workshop. On Monday, the number of boys who attended the workshop was 130 more than the number of girls. On Tuesday, the number of boys decreased by 20% whiles the number of girls increased by 20%. There were 574 participants on Tuesday. Find the total number of participants for both days. 8. Shannon had a collection of dolls. She had a total of 60 Cabbage Patch dolls, Barbie dolls and Porcelain dolls. The number of Cabbage Patch dolls is 20% the number of Barbie dolls and Porcelain dolls. The ratio of Barbie dolls to Porcelain dolls is 7:3. During the Great Singapore Sales, Shannon bought another 36 dolls. As a result, the number of Cabbage Patch dolls increased by 50% and the number of Barbie doll increased by 20%. Find the percentage increased in the number of porcelain dolls.

5 9. There were 480 passengers on board Aquarius Cruise Ship. There were 20% more men than women. There are 20% fewer children than women on the cruise. When the cruise reached Redang Island, 120 passengers boarded the Cruise. Both the number of men and children increased by 1 3 number of women? and 25% respectively. What was the percentage increase in the

6 10. Xiao Ming had a stamp album which contained 35 Malaysia stamps and 50 Singapore stamps. Ahmad had another stamp album which contained 45 Malaysia stamps and 10 Singapore stamps. After Xiao Ming gave Ahmad some Malaysia stamps and Singapore stamps, 40% of Xiao Ming s stamps are Malaysia stamps and 30% of the stamps in Ahmad s album are Singapore stamps. How many Malaysia stamps and Singapore stamps did Xiao Ming give Ahmad altogether?