Question
Average of 8 numbers is 30. If average of first four and
last two numbers is 20 and 50, respectively then find the fifth number given that ratio of fifth and sixth number is 7:5, respectively.Solution
Let fifth and sixth numbers be ‘7x’ and ‘5x’, respectively. So, 7x + 5x = 30 × 8 – 20 × 7 – 50 × 5 = 60 Or, 12x = 60 Or, x = 5 So, fifth number = 5 × 7 = 35
Statements:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Only boys are girls.
                               �...
Statements: Some printers are monitors.
All monitors are modems.
Some modems are keyboards.
Conclusions: I. Some keyboards are no...
Statements:
All pens are papers.
Some papers are not books.
All books are pencils.
Conclusions:
I. Some pencils ...
Statements:All flowers are books.
All books are carpets.
Some carpets are keys.
Some keys are locks.
Conclusions:I. Some key...
Statements: No book is a pen.
All copies are books.
All books are telephones.
No radio is a telephone.
Conclusions: I. ...
Statements:
Some years are months.
Some months are days.
Some days are weeks.
Conclusions:
I. No year is a da...
Statements:
Only a few blazers are red
Some red are black
No black are tie
Conclusions:
I. Some black are not red...
- Statements:
Only Laptops is Computer
No Monitor is Laptops
All Printers re Laptops
Conclusions:
I. All Laptops being Com... Statement:Â
All beds are cupboards.
Some beds are tables.
Some tables are pillows.
Conclusion:
I. Some cupboards are...
Statement:
No cat is dog.
Only a few cats are goats.
Some goats are not rats.
Conclusion:
I. Some goats are rats.
II. No rat is cat.
Relevant for Exams:
