Mathematics

Grade-8

Easy

Question

The duration to complete a work is 1 hour 15 minutes, the duration to complete 4 such works is

3 hours 60 minutes
4 hours
5 hours
4 hours 45 minutes

hint Hint:

Convert the time to one general unit to simplify solving the question.

The correct answer is: 5 hours

$G i v e n comma A space w o r k space i s space c o m p l e t e d space i n space 1 space h o u r space 15 space m i n u t e s space equals space open parentheses 60 space plus space 15 close parentheses m i n u t e s space equals space 75 space m i n u t e s T o t a l space n u m b e r space o f space w o r k s space t o space b e space c o m p l e t e d space equals space 4 T o space f i n d comma T i m e space t a k e n space t o space c o m p l e t e space 4 space s u c h space w o r k s space equals space open parentheses T i m e space t a k e n space t o space c o m p l e t e space 1 space w o r k close parentheses open parentheses T o t a l space n u m b e r space o f space w o r k s close parentheses space equals space open parentheses 75 close parentheses open parentheses 4 close parentheses space equals space 300 space m i n u t e s N o w comma 60 space m i n u t e s space equals space 1 space h o u r 300 space m i n u t e s space equals space x T h e r e f o r e comma x space equals space fraction numerator 300 cross times 1 over denominator 60 end fraction space equals space 5 space h o u r s H e n c e comma space t i m e space r e q u i r e d space t o space c o m p l e t e space 4 space s u c h space w o r k s space i s space 5 space h o u r s.$

The cost of 9 apples is $2.7, then the cost of 5 apples is

You can directly find the answer by using the cross multiplication method.

The cost of 9 apples is $2.7, then the cost of 5 apples is

MathematicsGrade-8

You can directly find the answer by using the cross multiplication method.

Grade-8

MathematicsVideo

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The duration to complete a work is 1 hour 15 minutes, the duration to complete 4 such works is

3 hours 60 minutes4 hours5 hours4 hours 45 minutes

Convert the time to one general unit to simplify solving the question.

The correct answer is: 5 hours

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3 hours 60 minutes
4 hours
5 hours
4 hours 45 minutes