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11.) There are 20 girls in a class. If ratio of girls to boys is 4:5, how many are boys?
A. 20
B. 25
C. 40
D. 100

12.) If 8 men can do a job in 12 days, how long will 6 men do the same job?
A. 4
B. 30
C. 36
D. 48

13.) If 30 men can construct a house in 12 days, how many men can do it in 10 days?
A. 4
B. 30
C. 36
D. 48​