Reena’s mother said, to make idlis, you must take two parts rice andone part urad dal. What percentage of such a mixture would be riceand what percentage would be urad dal?

Reenas mother said,to make idlis,you must take two parts rice and one part urad dal. What percentage of such a mixture would be rice and what percentage would be urad dal?

A radioisotope has half life of 10 years. What percentage of the original amount of it would you expect to remain after 20 years?

An article costing Rs. 20 was marked 25% above the cost price. After two successive discounts of the same percentage, the customer now pays Rs. 20.25. What would be the percentage change in profit had the price been increased by the same percentage twice successively instead of reducing it?

A charge 'Q' is divided into two parts A and B the two parts are separated by a certain fixed distance. Find for what charges on A and B would the force between them be maximum and comment when the force is minimum.

Even after reducing the marked price of a transistor by Rs.32, a shopkeeper makes a profit of 15%. If the cost price be Rs.320, what percentage of profit would he have made if he had sold the transistor at the marked price? a.10% b.20% c.25% d.none of these

A and B are enantiomer of each other. Specific rotation of A is 20^(@) .Rotation of mixture of A and B =-5^(@) what is the percentage of recemic part ?

Two xx a number is a 100% increase in the number.If we take half the number what would be the decrease in per cent!

Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder