In the given figure AD ‖ BC, if ∠ABC=72°, then ∠BCD=?

The pie chart below represents the instruments played by students of a school. Read the chart and answer the following questions based on it.

The sector angle corresponding to the Violin is 

If (x+y+z)=12, xy+yz+zx=44 and xyz=48, then what is the value of x³+y³+z³=?

The remainder when (15²³ + 23²³⁾ is divided by 19, is  

10 year ago, the ages of A and B were in the ratio 13 :17 respectively. 17 year from now the respective ratio of their ages will be 10:11. what is the age of B at present?  

The average age of Ram and his son is 48 years. The ratio of their ages 13 years ago was 11 : 3. What is the present age of son?

The sum of the squares of three numbers is 532 and the ratio of the second and also of the second to the third is 3 : 2 . What is the second number?

A wholesaler had 200 dozen of mangoes. He sold some of these mangoes at 20 % profit and the rest at 10 % profit, so that he made 13 % profit on selling all the mangoes. How many mangoes in dozens) did he sell at 20 % profit?