In a T.V. factory, an average of 60 TVs are produced per day for the fist 25 days of the months. A few workers fell ill for the next five days reducing the daily average for the month to 58 sets per day . The average production per day for day last 5 days is?

Let the age of youngest child be y.
so from question y + (y + 4) + (y + 8) + (y + 12) = 4 x 12
? 4y + 24= 48
? y = 6 years

New average = 120% of old average
=120% of 18.5
= (120 x 18.5) / 100
= 22.2

Age of coach = Total weight of 4 players and coach - total weight of 4 players
= 5 x 22.2 - 4 x 18.5
= 37 years

Weight of the teacher = Total weight of 40 students and teacher - total weight of 40 students
= 41 x 40.5 - 40 x 40 kg
= 60.5kg

Weight increase = 8 x 2 kg = 16 kg
weight of new man= 50 + 16 = 66 kg

Let the total number of workers be y.
So sum of salary for all workers = sum of salary of 7 technician + sum of salary for other y -7 workers.
7 x 1000 + 780(y -7) = 850 y
? 7000 + 780y - 5460 = 850y
? 70y = 1540
? y = 22

So total number of workers = 22

Let the number of candidate who passed = y
Then, 39y + 15(120 - y) =120 x 35
? 24y= 4200 -1800
? y= 2400 / 24 = 100

Let average of the remaining student be y.
Then from questions ( 5 x 10 ) + ( 5 x 14) + 20y = 30 x 12
? 50 + 70 + 20y = 360
? 20y = 360 ? 120
? 20y = 240
? y = 12.

Let the average for remaining 8 days be Rs. y a day.
Then, ( 4 x 40 ) + 8y = 504
? 8y = 344
? y = 43
? required average Rs. 43

From question
A + B + C = 3 x 84 = 252 ....(i)
A + B + C + D = 4 x 80 = 320 ...(ii)
From eq. (ii) - (i)
D = ( 320 - 252 ) = 68

From question E = D + 3
? E =( 68 + 3 ) = 71

Now , B + C + D + E = 4 x 79 = 316
? B + C + D = 316 ? 71 = 245
So , A = 320 - 245 = 75 kg .

Total present age of the family = 6 x 22
= 132 years

Total age of the family 7 years ago = 132 - 7 x 6
= 90 years

At that time, the number of members was 5
? Average age at time = 90 / 5 years
= 18 years