The average of five numbers is 54. If three of the numbers are 26, 28, and 30, what is
the average of the other two?
Answers
Answered by
4
answer:
answer is 68
Step-by-step explanation:
- so we know average or the mean is sum of all terms divided by number of terms
- sooo we get the equation
- 54 = (26 + 28 + 30 + a + b)÷5
- here a and b are the 2 unknown numbers
- so we get 220 = 84 +a +b on simplifying
- from here we get a+b = 136
- now the mean of the other 2 numbers is the mean of a and b which is
- mean = (a+b)÷2
- but a+b is 136 so your answer is 136÷2 that is 68
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Answered by
5
Answer:
Sum of 6 numbers =60×30=180
Sum of first 4 numbers =4×25=100
Sum of last 3 numbers =3×35=105
∴ Fourth number =(100+105)−180
=205−180
=25
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