in seven given numbers the average of first four numbers is 4 and that of the last four numbers is also 4. if the average of these seven number is 3 the fourth number is?
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d1+d2+d3+d4/4 = 4 ......(1)
d4+d5+d6+d7/4 = 4........(2)
.
d1+d2+d3+d4+d5+d6+d7/7 = 4 ........(3)
d4= ?
add 1 and 2
d1+d2+d3+2d4+d5+d6+d7/4 = 8
from 3
d4 + 28 = 32
d4 = 4
d4+d5+d6+d7/4 = 4........(2)
.
d1+d2+d3+d4+d5+d6+d7/7 = 4 ........(3)
d4= ?
add 1 and 2
d1+d2+d3+2d4+d5+d6+d7/4 = 8
from 3
d4 + 28 = 32
d4 = 4
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