Question

.30 students have some average age .One new student joins them of age 22 years so that new average decreases by 0.6 years. Find the new average of all 31 students

Answer 1

Answer:40

Step-by-step explanation:

Answer 2

Answer:

40 years

Step-by-step explanation:

30 students= S30/30= V

S30 = 30V ----> 1

One student is added

(S30 + 22)/31 = V - 0.6. ------> 2

S30 + 22 = 31(V - 0.6)

S30 + 22 = 31V -18.6

S30 = 31V-18.6 - 22

S30 = 31V - 40.6

eq 1 ---->

S30 = 30V

31V -40.6 = 30V

31V - 30V = 40.6

V = 40.6 years

eq 2 ---->

(S30 + 22)/31 = V - 0.6

(S30 + 22)/31 = 40.6 - 0.6

(S30 + 22)/31 = 40 years