Chapter 3
Ronny bought 80 pears for $60. He threw away 12 rotten ones and sold the rest at 4 for $5. How much money did he make?
He made $25.
The ratio of the number of Brian's books to the number of Gary's books is 5 : 9. Gary has 24 more books than Brian. If Gary were to give Brian 30 books, what would be the new ratio of the number of Brian's books to the number of Gary's books?
The new ratio would be 5 : 2.
Three clerks can type 6 research papers in 12 days. Working at the same rate, how long will it take for 2 clerks to type 3 such papers?
It will take them 9 days.
In a math contest, 60% of the students were girls. There were 80 more girls than boys. How many students took part in the contest?
400 students took part in the contest.
Jerry had 3 times as much money as Ian. After Jerry spent $9.50 and Ian was given $4.50, they each had an equal amount of money. How much money did Jerry have originally?
He had $21.
The ratio of the number of girls to the number of boys in a school is 5 : 8. There are 54 more boys than girls. If the number of girls increases by 10 and the number of boys decreases by 24, what will be the new ratio of the number of girls to the number of boys?
The new ratio is 5 : 6.
If 3 men take 2 days to paint 5 fences working at the same rate, how long will it take 2 men to paint one fence?
It will take 0.6 days.
There are 5% more boys than girls in a chess club. If there are 12 more boys than girls, how many students are there altogether?
There are 492 students altogether.
Devi and Gill started saving money at the same time. Each day, Devi saves $1.40 and Gill saves 30 cents more than Devi. When Gill has saved $5.40 more than Devi, how much money had Devi saved?
Devi saved $25.20.
Bob has $60 less than Jacky. 2/5 of Jacky's money is equal to 4/7 of Bob's money. How much money does Jacky have?
Jacky has $200.
The average of n whole numbers is 70. One of the numbers is 94. On removing the number 94, the average of the remaining numbers is 68. Find the value of n.
The value of n is 13.
Mish spent 60% of her savings on a new car and gave 25% of the remainder to her parents. She still had $720 left. How much was her savings?
Misha's savings was $2,400.
Roy had $1,200. He bought a cell phone with 2/5 of the money and a printer with 1/2 of the remaining money. How much money was he left with?
Roy was left with $360.
The ratio of Ling's money to Yan's money was 7:4 originally. After Ling gave $30 to Yan, they each had an equal amount of money. How much money did they have in total?
They had $220 in total.
Mrs. Jane drove a distance of 100 km from Village X to Village Y at an average speed of 60km/h. On her way back, she drove at an average speed of 45 km/h. What was her average speed for the entire journey?
Her average speed for the entire journey was 51 3/7 km/h.
Ricky has 420 Twitter followers. 180 of them are from Singapore and the rest are from the United States. What percent of U.S. followers more than Singapore followers does Ricky have?
There are 33 and 1/3% more U.S. followers than Singapore followers.
Two similar jugs and three bottles can hold 4.5 liters of water. Four such jugs and two such bottles can hold 1.7 more liters of water. How many liters can three such jugs hold?
Three such jugs can hold 3.6 L of water.
The ratio of the number of Dave's stamps to the number of Jane's stamps was 5 : 3. After they each bought 24 new stamps, the ratio became 3:2. How many stamps did Dave have initially?
Dave had 120 stamps initially.
Beth and Dave cycled from Town P to Town Q at 12 kilometers per hour and 10 kilometers per hour, respectively. Beth left Town P at 10:00 A.M. and arrived at Town Q at 10:30 A.M. When Beth reached Town Q, Dave was 1.5 kilometers away from Town Q. What time did Dave leave Town P?
Dave left Town P at 10:03 A.M.
82% of the fruits are in good condition.