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(4.20) + (5.40) + (6.70) + (8.a) + (10.10)
_____________________________________ = 6
20 + 40 + 70 + a + 10
80 + 200 + 420 + 8a + 100
_________________________ = 6
140 + a
800 + 8a = 6 . (140+a)
800 + 8a = 840 + 6a
8a - 6a = 840-800
2a = 40
a = 40/2
a = 20 .....(D)