$$ (17)^{2} + 6 × (13)^{2}-212×6$$

A man walking at a speed of 5 km / h crosses a bridge in 15 minutes, find the length of the bridge.

The cost price of 20 articles is the same as the selling price of x articles. If there is 25% gain, then the value of x

A person invested 1100 in a company at compound interest compounded semi-annually. He received 1331 after one year. The rate of interest per annum is 

Mr. Mike borrowed Rs. 8500 at 4 % per annum compound interest. The compound interest compounded annually for 2 yeas is:

If A is equal to 20% of B and B is equal to 25% of C; then what percent of C is equal to A?

In a triangle, ABC, P and Q are points on AB and AC, respectively, such that AP = 1 cm, PB = 3 cm, AQ = 1.5 cm, and CQ = 45 cm. If the area of ΔAPQ is 12 $${{cm^2}}$$, then find the area of BPQC.

A seller gives 15% discount on an item, if he marked up the price of item 40% above C.P and while selling he cheats the buyer by giving 10% less in weight. Find this overall profit percent (approximately).