Mathematical Operation questio...

What will be the difference between the first digit of the highest number as well as of the lowest number after the positions of the first two digits in each number of the following series 738, 429, 156, 273, 894 are reversed?

There are 120 students in a class, who read Maths or History or English. It is known that no student can read all three subjects. 24 read only Maths and History, 8 read only History and English and 21 read only Maths and English. 32 read only Maths and 13 only History. If 9 of the students who read only Maths start to read all three subjects, then find the percentage of students who read History?

A tree increases annually by 1/8th of its height. By how much will it increase after 2 years, if it stands today 64cm high?

Which of the following interchanges in signs will make the given equation correct?

17- 15 x 5 = 250

Which of the following interchanges in signs and numbers will make the given equation correct?

8 x 6 + 4 = 52