An alloy of copper and aluminum has 40% copper. Another alloy of Copper and Zinc has Copper and Zinc in the ratio 2: 7. These two alloys are mixed in ratio 5:3. Quantity of aluminum is what percent more/less than the quantity of copper in final alloy.

X and Y are centres of circles of radius 9 cm. and 2 cm respectively XY=17 cm. Z is the centre of a circle of radius r cm which touches the above circles externally. Given that - ∠xzy = 90^o the value of r is -

A is 4 years younger than B. B is 12 years younger than C. 4 years hence the ratio between C and A is 9:5, Find the age of B.

If 5^√x + 12^√x = 13^√x, then x is equal to: 

Vivek buys 3 shirts at an average price of Rs. 1250. If he buys 2 more shirts at an average price of Rs. 1450. What will be the average price (in Rs.) of all the 5 shirts he buys?

A can do a work in 24 days and B is 20% more efficient than A. If C can do the work in 10 days more than B, then find the days taken by A and C together to complete the work.

Simplify the following equation.
$$ {(100)}^{1\over2}.{(0.001)}^{1\over3}-{(0.0016)}^{1\over4}.{3}^{0}+({5\over4})^{-1} $$

The following table shows the number of units of product produced and sold by a company over the course of six years.

Find the ratio between the total number of units sold in 2013 and 2015 and the number of units produced in 2015 and 2016?