Question

THE AVERAGE OF 15 NUMBERS IS 21 AND THAT OF THE LAST 14 NUMBERS IS 20 .WHAT IS THE FIRST NUMBER

1) 35
2)66
3)9
4)7​

Answer 1

Answer : 35 option 1st , See above Photo for explanation

Answer 2

Answer:

35 is your answer

Step by Step Explanation:

Average of 15 numbers = 21

Sum of 15 numbers = 15×21 = 315

Average of 14 numbers = 20

Sum of first 14 numbers = 14×20=280

1st term = sum of 15 terms - Sum of 14

terms

=315−280

=35

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