Accuracy Quiz 3

Pipe A empties a water tank in 12 days. Pipe B empties the same tank in 8 days. If both pipe empty the tank at the same time, after how many days will the tank be empty?

• 5 days
• 6 days
• 3.2 days
• 7.5 days
• 4.8 days

A machine can print 30 files in 25 minutes. How many files can the machine print in one day?

• 2000 files
• 1200 files
• 960 files
• 1440 files
• 1728 files

Write down the formula of the following:
a. Area of a circle

b. Perimeter of a circle

A 5 m by 5 m square paper is cut into 4 equal smaller squares. What is the perimeter of the smaller square, in cm?

• 500

• 5

• 50

• 1000

• 100

Martin: "As long as I know the perimeter of a circle, I can always find its area."

• True
• False

The price of diamond changes over time. Last year, the price drops 20%. This year, the price goes up by 10%. What is the net percentage change from the original price?

• -12%
• +5%

• -10%
• 0%
• -5%

A bicycle is initially sold at 3/4 of its original price. Due to low demand, the price is further reduced by 1/5 of its current price. What percentage is the bicycle's final price of its original price?

• 66.66%

• 60%
• 50%
• 75%
• 30%

A planet has 3 moons. The first moon rotates half as fast as the second. The second moon rotates twice as fast as the third. Which 2 moons have the same speed of rotation?

• First moon and second moon
• Second moon and third moon
• First moon and third moon
• All moons have different speed

• All moons have same speed

A rectangle has a length of 10 m and a width of 4 m. If the length is increased by 50%, what is the ratio of the new area to the old area?

• 2.0
• 1.2
• 3.0
• 0.75
• 1.5

A tablecloth is sold for $10. The price of the table cloth increases by 20% each year. At the end of the second year, how much is the tablecloth worth?

• $12.00
• $16.00
• $18.00
• $10.50
• $14.40