Two men can complete a work in 9 days. How many men will be required to complete twice the work in 12 days?

Three numbers are in the ratio of 5: 6: 7. If the product of those numbers is 5670 then the largest number is-

A man invested a certain sum in scheme A at 15% p.a. for 2 years and earned Rs 1950 as simple interest. He increased his sum by Rs. ‘x’ and invested in another scheme B at 10% p.a. C.I. for 2 years and received Rs. 1680 as compound interest. Find the value of ‘x’. 

Study the graph carefully and answer the following questions.

What is the average production of State C for three years?

Three men step off together from the same spot. Their steps measure 63 cm, 70 cm and 77 cm respectively. The minimum distance each should cover so that all can cover the distance in complete steps is 

The ratio of the sides of a triangle is $$ {1\over2}$$: $$ {1\over3}$$: $$ {1\over4}$$ and its perimeter is 104 cm. is. What is the length of the longest arm?

The average of a,b,c is 20 and that of b,c,d is 25, if d=30, then the value of a is-

In a polygon, the sum of the interior angles is double the sum of the exterior angles. What is the number of sides of the polygon?