Question

The average score of Dhoni after 48 innings is 48 and in the
49th innings Dhoni scores 97 runs. In the 50th innings the
minimum number of runs required to increase his average
score by 2 than it was before the 50th innings :
(a) 99
(b) 149
(c) 151
(d) can't be determined
please explain the answer.
​

Answer 1

Answer:a

Step-by-step explanation:

Average of 48 innings is given by

Avg=(total runs of 48 innings/no. Of innings)

So 48=T/48 so

T=48×48

Now in the 49th inning he scored 97, so these runs will get added in the total runs and in the 50th inning his avg is increased by 2 than before that means avg becomes 48+2=50.

So, let X be the runs scored in 50th inning,

50=((48×48)+97+X)/50

X comes about 99

X=99 that means he has to score 99 runs in 50th inning to incrwase his avg by 2

Answer 2

Answer:

option b

Step-by-step explanation:

The average score after 48th innings =48 and the average score after 49th innings =49 Since,    Now, requirement of runs =49+(50×2)=149 ⇒ (50×51)−(49×49)=149