If A’s income is 40 % less than that of B, how much percent B's income is more than that of A? 

The lengths of the lengths placed on the sides of a point inside an equilateral triangle are 6 cm, 8 cm and 10 cm. What is the area of the triangle?

simplify the following equation
$$ (1-{1\over3})(1-{1\over4})(1-{1\over5})......(1-{1\over n})$$

A man spends $$ {2\over3}rd$$ of his income. If his income increases by 14 % and the expenditure increases by 20%, then the percentage increase in his savings will be

A vendor sells potatoes at a cost price, but he mixes some rotten potatoes and thereby gains 25%. The percentage of rotten potatoes in the mixture is? 

A book seller sells a book at a profit of 10 %. If he had bought it at 4 % less and sold it for Rs. 6 more. he would have gained $$18{3\over4}\%$$. The cost price of the book is 

A and B started a business in partnership. The ratio between the investments of A and B was 5: 4. If A invested for 12 months and at the end of the year the ratio of prot was 15: 8, then for how much time B invested?

According to the will the wealth of Rs. 21,25,000 was to be divided between the son and the daughter in the ratio $$ {7\over6}:{5\over3}$$. How much did the son get (in Rs.)?