At what profit percent must an article be sold so that by selling at half that price, there will be a loss of 30%?

The speed of three cars is in the ratio of 2 : 3 : 4 . The ratio of the times taken by these cars to travel th...

A man swimming in a stream which flows km/hr finds that in a given time he can swim twice as far with the stre...

Which number is appropriate in place of question mark?

There are 3 green, 4 orange and 5 white colour bulbs in a bag. If a bulb is picked at random, what is the prob...

In the figure, AD and BC are lines intersecting at O. What is the value of a?

The tax on a commodity is diminished by 10% and its consumption increases by 10%. Find the effects on revenue.