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(21) . Twelve men take 6 hours to finish a piece of work. After the 12 men have worked for 1 hour, the contractor decides to call in 8 more men. How many more hours would 20 men take to complete the remaining work?

(22) . A person can do the work in 10 days but another finishes the same work in 15 days, Together they can finish in how many days?

(23) . The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back from Allahabad to Nagpur, its speed is 150 km/h. Find the average speed during whole journey?

(24) . The average of a group of men is increased by 5 years when a person aged of 18 years is replaced by a new person of aged 38 years. How many men are there in the group?

(25) . A person paid 2% commission to the property dealer when he bought a land worth Rs 6 crore and 75 lakhs What is the amount of commission paid?

(26) . Arif, Hafiz and Haider share Rs 2560. Hafiz's share is four times as much as Arif's and Arif's share is one-third of Haider's. How much is the share of Arif?

(27) . Five years ago, the average age of A, B, C and D was 45 years with E joining them now, the average of all the five is 49 years. How old is E?

(28) . The width of a rectangle is twice the size of its length The length is increased by 30% and width is increased by 20%, what will be the percentage change in the area of rectangle?

(29) . If the 10% of daily wagers were fired while 540 workers survived. how many workers were originally there?

(30) . The number of elements in power set of (1, 2, 3) is?