Question

Average weight of 11 students is 30 kg. if the average weight increases by 0.5 kg when suresh, one of the students leaves the group, what is the suresh's weight?

Answer 1

Let the sum of 11 students be = S
Let weight of Suresh = x

Intial average = 30
Intial students = 11
>>
S/11= 30
>>
S = 330
New average = 30-0.5=29.5
New students = 10
>>
(S - x)/10 =29.5
S- x = 295
330 - x = 295
X = 35 kg ans

Answer 2

Hello trishna,

See for these types of question just follow the basic steps,

Step-by-step explanation:

First write the given informations.

Initial(starting) avg=30

Initial(starting) students=11

Now let us assume the total sum of the weight of these 11 students as S. Remember we are solving the initial first.

S/11=30

S=330

Now the final avg=30+0.5=30.5

Remember that we have added this because the 0.5 is increased not decreased.

Final students=10

Let the weight of suresh be x

S-x/10=30.5

S-x=305

Put the values

330-305=x

25=x

That is suresh's weight it 25 kg.

Hope it helps ,keep learning✌