Question

The average of 5 number is 281.the average of first two no. is 280 and the average of last two no is 178.5.what is third number?

Answer 1

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we know that...
sum =its average × no. of elements
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now.......
according to the question..
here .......given that.........
.The average of 5 number is 281.
the average of first two no. is 280
the average of last two no is 178.5
••••••••••••••••••••••••••••••••
sum of all no
= 281×5=1405
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sum of first two
=280×2=560
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
sum of last two
= 178.5×2=367
••••••••••••••••••••••••••••••••
now .....
third no..
= 1405-(367+560)
= 1405 - 927
= 478
hence third no..
is 478
it is answer
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Answer 2

Answer:

178.5×3=367wrong /178.5×2=357

Step-by-step explanation: