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If 12 workers can complete a project in 15 days, how many days will 10 workers take to complete the same work at the same rate?
A16 days
B18 days
C20 days
D22 days
The ratio of two numbers is 3:5. If their sum is 160, what is the value of the larger number?
A60
B80
C100
D120
What is the area of a right-angled triangle with a base of 12 cm and a hypotenuse of 13 cm?
A30 cm²
B60 cm²
C65 cm²
D78 cm²
A bag contains 4 red balls, 5 blue balls, and 3 green balls. If one ball is drawn at random, what is the probability that it is NOT blue?
A5/12
B7/12
C1/3
D3/4
Two numbers are in the ratio 5:8. If 4 is added to each number, the ratio becomes 2:3. What is the smaller number?
A10
B15
C20
D25
If a work is completed by 8 workers in 12 days, how many extra workers are needed to finish it in 8 days?
A2
B4
C6
D8
The average score of 4 tests is 85. What score is needed on the 5th test to raise the average to 87?
A90
B92
C95
D97
A clock striking 6 times takes 10 seconds. How long will it take to strike 12 times?
A20 seconds
B22 seconds
C24 seconds
D26 seconds