In a class, average mark in an exam is 70. The average of student of student who scored below 6o is 50. The avearge of srudents who scrord 60 or more is 75 It the total number of students in this calss is 20, how many students scored 60 or more?

Two tanks A and B are are filled with petrol. Tank A holds 600 litre more than tank B. If 100 litre of petrol...

How mant psoitive intigers less than 20 are equal to sum of a positive multiple of 3 and a positive multiple o...

If three metal cubes having sides of 3 cm, 4 cm and 5 cm were melted to make a single cube, what would be the...

Two items were sold together for taka 3600. One item was sold at 20% profit while the other was sold at 20% lo...

Baki lives miles west of Raju's . Rafiq lives 3 lives north of Raju's house and 2 miles west of Diba's house....

If the average of 7,13, p and q is 17, what is the average of (p+11) and (q-9)?