The average height of a class of 18 students is 105 cm. After the arrival of 7 new students the average decreases by 5cm. Find the height of new students in class.
Answers
Answer:
The right Answer is 2500
Step-by-step explanation:
The average height of 18 students is 105cm
Then
Average = X/ Total numbes
105cm = x/ 18
X = 18*105
X = 1890
If the average is decreased by 5cm
Then 105cm-5cm = 100cm
After the arrival of 7 new students the total students will be 18+7 = 25
Average = y / Total numbers
100cm = Y/ 25
Y = 100*25
Y= 2500
The data given in the question is the average height of 18 students is 105 cm.
which is x/18=105.
The total height of the 18 students x =18(105) =1890 cm.
The no. of. new students added were 7.
On adding the average height was reduced by 5 which is (105-5) cm=100cm.
In this case the total number of students will be
18 old students + 7 new students=25 students.
The total height of all students is 2500.
Here, in the question it was asked that the height of new students which is 7(100) =700cm.
Therefore, the final answer is 700 cms.
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