The respective ratio between the present age of Aarti and Savita is 5 : x. Aarti is 9 years younger than Jahnavi. Jahnavi’s age after 9 years will be 33 years. The difference between Savita’s and Aarti’s age is same as the presen age of Jahnavi. What will come in place of x ?

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The respective ratio between the present age of Aarti and Savita is 5 : x. Aarti is 9 years younger than Jahnavi. Jahnavi’s age after 9 years will be 33 years. The difference between Savita’s and Aarti’s age is same as the presen age of Jahnavi. What will come in place of x ?

A21

B37

C17

DNone of these

Nithin ? undefined

Correct answer is: None of these

Explanation:

Jahnavi’s present age = 33 - 9 = 24 years
=> Aarti’s present age = 24 - 9 = 15 years
Now, Aarti : Savita = 5 : x = 15 : 3x
=> Savita’s present age = 3x years

\(\therefore 3x - 15 = 24\)

\(\implies 3x = 24 + 15 = 39\)

\(\implies x =\frac{39}{3}= 13\)

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The average marks in English subject of a class of 24 students is 56. If the marks of three students were misread as 44, 45 and61 of the actual marks 48, 59 and 67 respectively, then what would be the correct average ?

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The average marks in English subject of a class of 24 students is 56. If the marks of three students were misread as 44, 45 and61 of the actual marks 48, 59 and 67 respectively, then what would be the correct average ?

A56

B55

C57.5

D57

Nithin K ? May 24 '2017 at 20:51

Anwer is : 57

Explanation:

Difference = 48 + 59 + 67 - 44 - 45 - 61= 24

Correct average = \(56+ \frac{ 24}{24} = 57\)

 

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