Each of A., B, C and D has Rs 100. A pays Rs 20 to B, who pays Rs 10 to C, who gets Rs 30 from D. In this context, which one of the following statements is not correct?

There are 1000 people in a flat.40% read Malayalam Newspaper,20% read English,10% read both.Find the number of persons who read neither

There are 500 students in a hostel.Of these,20% drink coffee.50% drink tea.10% drink both.Find the number of students who drink neither

If length of a rectangle is increased by20% and breadth decreased by 10%,find change in area

A man sold 2 mobile phones at the rate of 1500Rs each.If he gets a profit of 20% in one transaction and a loss of 20% in another transaction,find by what percent he lost or gained in the whole.

If a number is increased by 40% and decreased by 40%,what will be the result?