Latest GRE Aptitude Question SOLUTION: The average height of 25 students in a class is 140 cm. five newly admitted students increase the average height by 1 cm. The average height of the set of 5 new student is 146.2 cm

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(#M40017825) GRE Numerical Ability question Ages Keep an EYE

The average height of 25 students in a class is 140 cm. five newly admitted students increase the average height by 1 cm. The average height of the set of 5 new student is
146.2 cm
147 cm
145 cm
146 cm
148 cm

Asked In GRE Vijesh Jain (11 years ago)

Solved rashik fareeth Read Solution (5)

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Read Solution (5) :

rashik fareeth  (11 years ago)

The average height of 25 students is 140cm
total height of 25stdnts
=25*140cm
=3500cm
add 5studnts avg height incrs 1cm...so
30stdnts averge height is 141cm
total height of 30stdnts
=30*141cm
=4230cm
total height of 5stdnts=30stdnts total height-25stdnts total height
=4230- 3500
=730cm
avg height of 5 stdnts
=730/5
=146cm

Is this solution Helpfull? Yes (7) | No   

hemanth  (11 years ago)

25+new students5=30
140cm+1cm=141
30*141=4230
1studen=4230
30*141-25*140=730
avg height is 730/5=146cm

Is this solution Helpfull? Yes (2) | No   

rashik fareeth  (11 years ago)

The average height of 25 students is 140cm
total height of 25stdnts
=25*140cm
=3500cm
add 5studnts avg height incrs 1cm...so
30stdnts averge height is 141cm
total height of 30stdnts
=30*141cm
=4230cm
total height of 5stdnts=30stdnts total height-25stdnts total height
=4230- 3500
=730cm
avg height of 5 stdnts
=730/5
=146cm

Is this solution Helpfull? Yes (1) | No   

venkatesh  (10 years ago)

x/25 = 140 -> x = 3500
(3500+y)/30 = 140+1 = 141
y = 4230-3500 = 730
->avg ht of 5 stu is 730/5 = 144

Is this solution Helpfull? Yes (1) | No (3)  

Akshay Jadhav  (9 years ago)

avg ht after adding 5 new student is increased to 141 i.e when 5 new students were added height increased by 30 student * 1 cm = 30 cm i.e 5 student added 30cm to avg i.e each student added 30/5=6cm hence avg height of 5 student will be 140+6=146cm

Is this solution Helpfull? Yes (1) | No   

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