Question

If anshul gets 71 in his next text, his average will be 83. If he gets 99, his average will be 87. How many tests has anshul given?

Answer 1

average =total marks /total number of test
Anshul get 71 marks in his average will be 83
Therefore
83=total marks +71/total number of test

total number of test *83=total marks + 71

and if he gets 99 is average will be 87
therefore
87=total marks + 99/total number of test
comparing this both equation we get

(total marks + 99) 83=87(total marks +71)
8217=4*total marks +6177

total marks is equal to 510
substituting total marks in equation when we get
number of test is equal to 510+71/83
=7