Access over 20 million homework & study documents
search

Arithmetic & Average Questions

Content type

User Generated

Subject

Arithmetic

Type

Other

Rating

Showing Page:
1/6
MATHS QUESTIONS AND ANSWERS
TOPIC: AVERAGE SMA 5000
SUMMER 2020
1.Ajit has a certain average for 9 innings. In the tenth innings, he scores 100 runs thereby
increasing his average by 8 runs. His new average is:
SOLUTION
Let Ajit's average be x for 9 innings. So, Ajit scored 9x run in 9 innings.
In the 10th inning, he scored 100 runs then average became (x+8). And he scored (x + 8) × 10
runs in 10 innings.
Now,
9x+100=10×(x+8)
or,9x+100=10x+80
or,x=100−80
or,x=20
New average=(x+8)
=28runs
2.The average temperature for Wednesday Thursday and Friday was 40 degrees Celsius. The
average for Thursday Friday and Saturday was 41 degrees Celsius. If temperature on Saturday
was 42 degrees Celsius , what was the temperature on Wednesday?
Solution:
Average temperature for Wednesday, Thursday and Friday = 40° C
Total temperature = 3 × 40 = 120° C
Average temperature for Thursday, Friday and Saturday = 41° C
Total temperature = 41 × 3 = 123° C
Temperature on Saturday = 42° C

Sign up to view the full document!

lock_open Sign Up
Showing Page:
2/6
Now,
(Thursday + Friday + Saturday) - (Wednesday + Thursday + Friday) = 123 - 120;
Saturday - Wednesday = 3
Wednesday = 42 - 3 = 39° C
The average of the first five multiples of 9 is:
Solution
Required average
=(total sum of multiple of 9) / 5
=(9+18+27+36+45) / 5
=27
Note, average of 9 and 45 is also 27.
And average of 18 and 36 is also 27.
3.The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back
from Allahabad to Nagpur, its speed is 150 km/h. find the average speed during whole journey.
Solution
Average speed,
=2×X×Y /X+Y
=2×100×150 /100+150
=200×150 /250
=120km/hr
4.In a boat there are 8 men whose average weight is increased by 1 kg when 1 man of 60 kg is
replaced by a new man. What is weight of new comer?
Solution

Sign up to view the full document!

lock_open Sign Up
Showing Page:
3/6

Sign up to view the full document!

lock_open Sign Up
End of Preview - Want to read all 6 pages?
Access Now

Unformatted Attachment Preview

MATHS QUESTIONS AND ANSWERS TOPIC: AVERAGE SMA 5000 SUMMER 2020 1.Ajit has a certain average for 9 innings. In the tenth innings, he scores 100 runs thereby increasing his average by 8 runs. His new average is: SOLUTION Let Ajit's average be x for 9 innings. So, Ajit scored 9x run in 9 innings. In the 10th inning, he scored 100 runs then average became (x+8). And he scored (x + 8) × 10 runs in 10 innings. Now, ⇒9x+100=10×(x+8) or,9x+100=10x+80 or,x=100−80 or,x=20 New average=(x+8) =28runs 2.The average temperature for Wednesday Thursday and Friday was 40 degrees Celsius. The average for Thursday Friday and Saturday was 41 degrees Celsius. If temperature on Saturday was 42 degrees Celsius , what was the temperature on Wednesday? Solution: Average temperature for Wednesday, Thursday and Friday = 40° C Total temperature = 3 × 40 = 120° C Average temperature for Thursday, Friday and Saturday = 41° C Total temperature = 41 × 3 = 123° C Temperature on Saturday = 42° C Now, (Thursday + Friday + Saturday) - (Wednesday + Thursday + Friday) = 123 - 120; Saturday - Wednesday = 3 Wednesday = 42 - 3 = 39° C The average of the first five multiples of 9 is: Solution Required average =(total sum of multiple of 9) / 5 =(9+18+27+36+45) / 5 =27 Note, average of 9 and 45 is also 27. And average of 18 and 36 is also 27. 3.The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back from Allahabad to Nagpur, its speed is 150 km/h. find the average speed ...
Purchase document to see full attachment
User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Anonymous
Really helped me to better understand my coursework. Super recommended.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4