General Mathematics

Question: Out of four numbers, the average of first three is `16` and that of the last three is `15`.If the last numbers is `18`the fisrt number is :
A
`20`

B
`21`

C
`23`

D
`25`

Note: Sum of 2nd & 3rd number `= (3 xx 15 -18)` `= 27` :. First number `= (3 xx 16 - 27)` `= 21`.
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Question: Mukesh has twiec as much money as Sohan and has `50‰`more money than what pankaj has. Ifthe average money with them is Rs `110`,then Mukes has :
A
`Rs 55`

B
`Rs 60`

C
`Rs 90`

D
`Rs 180`

Note: Not available
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Question: A motorist travels to a place `150`km away at an average speed of `50`km per hour and returns at `30`km per hour .His average speed for the whole journey in km per hour is :
A
`35`

B
`37`

C
`37.5`

D
`40`

Note: Average speed `= (2xy)/(x + y) km∕hr` `= ((2 xx 50 xx 30)/(50 + 30)) km∕hr` `= 37.5 km∕hr`
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Question: The total of the present ages of P Q R and S is `96` years. To find out Q,s present age,which of the following informations given in statements A and B is/are sufficient / A.The averagae age of P,Q,and S is `20` years B.The average age of R and S is `25` years
A
Both A and B are needed

B
Both A and B are not sufficient

C
Only B is sufficient

D
Only A is sufficient

Note: Clearly ,both A and B are not sufficient.
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Question: The average of `5`numbers is `7`.When `3` new numbers are added ,the average of the eight numbers is `8,.5`The average of the three new numbers is :
A
`11`

B
`7.75`

C
`8.5`

D
`7`

Note: Sum of three new numbers `= (8 xx 8.5 - 5 xx7)` `= 33` :. Thier average `= 33/3` `= 11`
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Question: The average age of `30`students is `9` years. If the age of thier teacher is inclued,it becomes `10` years .The age of the teacher (in years) is :
A
`27`

B
`3`

C
`35`

D
`40`

Note: Age of the teacher `= (31 xx 10 + 30 xx 9)` `= 40 years`
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Question: The average age of `24` boys and the teacher is `15` years. when the teacher,s age is excluded, the average decreases by `1`.What is the age of the teacher ?
A
`38 years`

B
`39 years`

C
`40 years`

D
Data inadequate

Note: Age of the teacher `= (25 xx 15 - 24 xx 14)` `= 39 years`
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Question: The average wieght of `50` balls is `2`lbs.If the wieght of the container be included, the average wieght will increase by `0.05` lbs.The wieght of the container is :
A
`4.55 lbs`

B
`2.2 lbs`

C
`2.3 lbs`

D
`2.5 lbs`

Note: Weight of the container `= (51 xx 2.05 - 50 xx 2) lbs`. `= (104.55 - 100) lbs -` `= 4.55 lbs`.
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Question: The average weight of `29` students is `28` kg. By the admission of a new student,the average weight is resuced to `27.8 kg.The weight of the new student is :
A
`22 kg`

B
`21.6 kg`

C
`22.4 kg`

D
`21 kg`

Note: Weight of the new student `= (3 xx 27.8 - 29 xx 28) kg` `= 22 kg`.
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Question: The average selary per month of `30` employees in a company is Rs `4000`. If the manager,s salary is added, the average salary incrses to Rs`4300, what is the salary of the manager ?
A
`Rs 10000`

B
`Rs 13000`

C
`Rs 12000`

D
`Rs 13300`

Note: Salary of the manager `= Rs (31 xx 4300 - 30 xx 4000)` `= Rs 13300`.
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Question: Out of four numbers, the average of first three is `16` and that of the last three is `15`.If the last numbers is `18`the fisrt number is :

Question: Mukesh has twiec as much money as Sohan and has `50‰`more money than what pankaj has. Ifthe average money with them is Rs `110`,then Mukes has :

Question: A motorist travels to a place `150`km away at an average speed of `50`km per hour and returns at `30`km per hour .His average speed for the whole journey in km per hour is :

Question: The total of the present ages of P Q R and S is `96` years. To find out Q,s present age,which of the following informations given in statements A and B is/are sufficient / A.The averagae age of P,Q,and S is `20` years B.The average age of R and S is `25` years

Question: The average of `5`numbers is `7`.When `3` new numbers are added ,the average of the eight numbers is `8,.5`The average of the three new numbers is :

Question: The average age of `30`students is `9` years. If the age of thier teacher is inclued,it becomes `10` years .The age of the teacher (in years) is :

Question: The average age of `24` boys and the teacher is `15` years. when the teacher,s age is excluded, the average decreases by `1`.What is the age of the teacher ?

Question: The average wieght of `50` balls is `2`lbs.If the wieght of the container be included, the average wieght will increase by `0.05` lbs.The wieght of the container is :

Question: The average weight of `29` students is `28` kg. By the admission of a new student,the average weight is resuced to `27.8 kg.The weight of the new student is :

Question: The average selary per month of `30` employees in a company is Rs `4000`. If the manager,s salary is added, the average salary incrses to Rs`4300, what is the salary of the manager ?