Ques:- The average weight of a group of boys is 30 kg. After a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally ?
Recent Answer : Added by Vivek verma On 2021-08-25 14:15:38:
let no of boys in group is = x
then total sum = 30 * x
after joining one more boys with a weight of 35 kg the total sum is = 30x + 35
after joining the new student the weight will increase 1 kg
so total sum
30x + 35 = 31(x+1)
x = 4
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A. 200
B. 400
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D. 800
Recent Answer : Added by Phani On 2022-03-09 16:41:44:
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Recent Answer : Added by Admin On 2020-05-17 12:04:12:
CASE 1: First we should take six balls divided equally and
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divided equally and then it is placed on the two pans.. if
any of the pan weighs less than the other.. We should take
the three balls seperately..Now from that three we should
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balances the ball which is left over is the defective.. if
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Recent Answer : Added by Admin On 2020-05-17 12:03:49:
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let no of boys in group is = x
then total sum = 30 * x
after joining one more boys with a weight of 35 kg the total sum is = 30x + 35
after joining the new student the weight will increase 1 kg
so total sum
30x + 35 = 31(x+1)
x = 4