Cost of 36 pens and 42 Pencils is Rs 460. What is the cost of 18 pens and 21 pencils?

A, B and C contract a work for Rs. 550. Together A and B are to do 7/11 of the work. The share of C should be?

Four years ago, the ratio of the age of A and B was 2 : 3 and after four years it will become 5 : 7. Find the present age. 

The area of triangle is half the area of square. The perimeter of the square is 224 cm. What is the area of triangle?

A, B and C entered into a partnership with investment in the ratio 2 : 3 : 4. After one year A doubled his investment and C withdrew half of his amount. After one more year, B doubled his investment. At the end of three years, they earned a profit of Rs.90000. find the share of A in the profit.

The HCF of two numbers, each having three digits, is 17 and their LCM is 714. The sum of the numbers will be: 

From a point P on the ground the angle of elevation of the top of a 10m tall building is 30°. A flag is hoisted at the top of the building and the angle of elevation of the top of the flagstaff from P is 45⁰. Find the length of the flagstaff (Take √3 = 1.732) 

C can do a work alone in 120 days. B is twice as efficient as C and A is thrice as efficient as B. In how many days can they work Finish together?