For the following questions answer them individually
Taps A and B can fill a tank in 10 hours and 15 hours3respectively. The time taken (in hours) for both the taps together tofill the tank is
A merchant prepares the market price of the article at a profit of 40% and sells them giving a discount of 10%. If an article is sold for ₹ 630, then its cost price (in rupees) is
If $$\left(\frac{4}{5}\right)^{th}$$ of a bucket is filled in one minute, the rest of it will be filled in
If the area of a triangle with base x is equal to the area of a square with side x, then the altitude of the triangle is
The area of a trapezium is 220 sq. cm. and its height is 8 cm. If the sum of the non-parallel sides is 20cm, its perimeter (in cm) is