The LCM of 28, 60, 120 and 135 is:
In an examination, there were three papers of Mathematics, two papers of English and one paper of Science. All papers were of 100 marks. S got 60% in Mathematics, 70% in English and 50% in Science. What was his percentage of marks in all papers?
A number is first decreased by 15% and then increased by 20%. The number so obtained is 78 more than the original number. The original number is:
