Start learning 50% faster. Sign in now
15 years ago, Average age of 80 teachers = 50 years 8 years ago (just before retirement of Principal), Average age of 80 teachers = 50 + 7 = 57 years And the same time total age of 80 teachers = 80 × 57 = 4560 years And the total age of remaining 79 teachers when just the principal has retired = 4560 – 60 = 4500 years 1 year later (i.e, 7 years ago from present) Total age of 79 teachers (just before the recruitment of new Principal) = 4500 + (1 × 79) = 4579 years And the total age of 80 teachers including new principal just after the recruitment = 4579 + 56 = 4635 years Thus, the present age of all 80 Teachers = 4635 + (7 × 80) = 5195 years ∴ Present average age of all the 80 Teachers = 5195/80 years. Alternate method: Let the present average age of all teachers be X The sum of the age of all the teachers 15 years ago = 80 × 50 = 4000 years 8 years ago the sum of the age of the teachers = 4000 + (7 × 80) - 60 = 4000 + 560 - 60 = 4500 years When new principle is recruited then age of the teachers = 4500 + (79 × 1) + 56 = 4500 + 79 + 56 = 4635 years The sum of the age of the teachers at present = 4635 + (7 × 80) = 4635 + 560 = 5195 years The present average age of all the teachers = 5195/80
Which of the following is true about Partitions of Hard Disc
What is the new default document name in MS Word?
Enter key is an alternative to press ________ button?
What process should be used to recall a document saved previously?
What is the shortcut key for Spell check in document.
In MS Excel 365, which of the following is an example of absolute reference pointing to cell A1?
In MS Excel 365, which Microsoft Excel view allows you to see how the printed worksheet will look before actually printing it?
Which file format allows you to save a PowerPoint presentation that can be played on any computer without requiring PowerPoint?
The process of trying out a new product by independent users before it is finally manufactured/ developed is known as?
...How can you hide a slide in a presentation without deleting it?