Question

average weight of p,q,r s is 50 kg . a new person ' t' included in the group , then the average wieght of the group increasd by 1 kg , again a new person ' u' replace 'p' then the new average of the group become 52 kg . find the average of qrsu

Answer 1

Step-by-step explanation:

P+Q+R = 84*3 = 252 P+Q+R+S = 4*80 = 320 S = 320 252 = 68 Q+R+S+T = 79*4 = 316 Q+R+2S+3 = 316 S =68, Q+R =177 P = 252 177 = 75

Answer 2

Answer:

The average of qrsu is 51.25 kg

Step-by-step explanation:

As per the data given in the question,

We have,

Avg weight = 50

So, total weight  = $50\times4=200$

After adding t, the avg weight becomes 51.

$200+t=51\times5\\t=255-200\\t=55$

So, weight of t is 55 kg

Since u replaces p. So, total weight will be 255-50+u

And avg becomes 52 kg

$255-50+u=52\times5\\205+u=260\\u=55$

So, wt. of u = 55 kg

Now, avg of qrsu:

Now, q,r,s = 50 kg each and s=55 kg

So, avg = $\frac{50\times3+55}{4} =\frac{205}{4} =51.25$

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