Question

if anshul gets 71 in his next test his average will be 83 if he gets 99 his average will be 87 how many test has anshul taken?

Answer 1

Let the number of tests he has taken be n

Total score = x

If he gets 71 in the next test the average is 83:

Average = (x + 71)/(n + 1) = 83

x - 83 = 12 ---------- (i)


If he gets 99, the average will be 87

(x + 99)/(n + 1) = 87

x - 87n = -12 ------ (ii)

Subtract (ii) from (i)


4n = 24


n = 6

He has taken 6 tests

Answer 2

Answer:

Step-by-step explanation:

Let the number of tests he has taken be n

Total score = x

If he gets 71 in the next test the average is 83:

Average = (x + 71)/(n + 1) = 83

x - 83 = 12 ---------- (i)

If he gets 99, the average will be 87

(x + 99)/(n + 1) = 87

x - 87n = -12 ------ (ii)

Subtract (ii) from (i)

4n = 24

n = 6

He has taken 6 tests