For the following questions answer them individually
X can do a piece of work in 'p' days and Y can do the same work in 'q' days . Then the number of days in which X and Y can together do that work is
A shopkeeper marks his goods 40% above the cost price and allows a discount of 25% on it. His gain % is
The ratio of the ages of two boys is 3:4. After 3 years, the ratio will be 4:5.The ratio of their ages after 21 years will be
The cost price of 25 books is equal to the selling price of 20 books. The profit percent is
One number is 25% of another number. The larger number is 12 more than the smaller. The large number is
A train 500 m long, running at a uniform speed, passes a station in 35 sec. If the length of the platform is 221 m, the speed of the train in km/hr is
If the simple interest on Rs. 400 for 10 years is Rs. 280, then rate of interest per annum is
If a+b=2c, then the value of $$\frac{a}{a-c}+\frac{c}{b-c}$$ is equal to where $$a\neq b \neq c$$
G and AD are respectively the centroid and median of the triangle ΔABC.The ratio AG:AD is
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