6. Total age of Ravi and Shiva is 15 years more than that of Shiva and Mohit. While the average age of Ravi, Shiva and Mohit is equal to that of Ravi and Shiva. Then what is the difference between the ages of Ravi and Shiva?
(a) 15
(b) 30
(c) 10
(d) 20
(e) None of these
7. A number is greater than the cube of 35 but smaller than the cube of 36. If two factors of the number are the squares of 5 and 7, and the number is a multiple of 3, then find the number.
(a) 44175
(b) 44100
(c) 44004
(d) Cannot be determined
(e) None of these
8. A crop field can be ploughed in 16 days. If 18 more hectares of land is ploughed daily, the work will be finished in 10 days. Find the area of the cropfield.
(a) 480 hectares
(b) 520 hectares
(c) 440 hectares
(d) 500 hectares
(e) None of these
9. A watch costing Rs. 425 is marked to be sold at a price which gives a profit of 20%. What will be its selling price in a sale when 15% is taken off the marked price?
(a) Rs. 442
(b) Rs. 430
(c) Rs. 438
(d) Data inadequate
(e) None of these
10. Find the value of x in the equation
[(x)^3 + 3x] / [3(x)^2 + 1] = 1241/217
(a) 17
(b) 19
(c) 13
(d) 27
(e) None of these
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