Question

The average of five results is 46 and that of the first four is 45. The fifth result is:

Answer 1

Answer: 50

Step-by-step explanation:  

Sum of 5 results = 46\ast 5= 230

Sum of the first 4 = 4\ast 45= 180

Fifth Number  = 230-180 = 50

Answer 2

T1+T2+T3+T4+T5/5 = 46 .. (i)

T1+T2+T3+T4/4 = 45 .. (ii)

from (ii)

T1+T2+T3+T4 = 45 *4

T1+T2+T3+T4 = 180 .. (A)

substituting (A) in (i)

180 + T5 = 46*5

T5= 50