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If log_10(2) = 0.3010, what is the value of log_10(80)?

A1.6020

B1.9030

C2.1030

D2.4080

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If x : y = 3 : 4, find the value of (5x – 2y) : (7x + 2y).

A7 : 29

B7 : 23

C5 : 29

D11 : 23

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The average age of 30 students in a class is 15 years. If the teacher’s age is included, the average increases by 1 year. What is the teacher’s age?

A44 years

B46 years

C48 years

D50 years

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A can finish a work in 12 days and B can finish it in 18 days. A works alone for 3 days and then B joins him. In how many more days will the work be completed?

A5.4 days

B6 days

C6.5 days

D7 days

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A trader marks his goods 20% above the cost price and allows a discount of 10%. What is his profit percentage?

A8%

B10%

C12%

D15%

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A sum of money doubles itself at simple interest in 8 years. What is the rate of interest per annum?

A10%

B11.5%

C12.5%

D15%

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The sum of ages of a father and his son is 45 years. Five years ago, the product of their ages was 124. How old is the father now?

A36 years

B38 years

C40 years

D42 years

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The ratio of two numbers is 4:5 and their HCF is 12. What is their LCM?

A120

B180

C240

D300

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A train running at a speed of 90 km/h crosses a pole in 10 seconds. What is the length of the train?

A150 m

B200 m

C250 m

D300 m

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A box contains 5 red and 5 blue balls. Two balls are drawn one by one WITH replacement. What is the probability that both are red?

A1/4

B1/2

C3/4

D1/5

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