5 years ago father's age was four times his son's, and at present father's age is three times the son's. Then what will be the sum of the ages of father and son after 15 years ?

A shopkeeper bought an item at 10% discount on its original price. He sold it at 35% increase on the original price. What percentage profit did he get ?

A bike travels a distance of450 km in 5 hours, partly at a speed of 100 knur1 and partly at 75 kmh-1. What is the distance travelled at speed of 100 kmh1 ?

Direction (Q. 6 - 10) : Total number of students studying in two engineering colleges 'A' and 'B' are respectively 800 and 1000.
In the given pie-charts the distribution of students according to their streams is given.
Answer the following questions based on the charts. A = 800

What is the number of students studying in Computer Science in both colleges together ?

What is the difference between the number of students studying in Civil branch in College A and the number of students studying Electronics in College B ?