Maths
posted by Tarunima .
Average mass of d,k,l 42 .D is 6 kg heavier than average mass of k and l .k is 6 kg heavier than l. Find mass of d

Maths 
Steve
what do we know?
(d+k+l)/3 = 42
d = 6+(k+l)/2
k = l+6
So, start substituting:
d+l+6+l = 126
2d = 12+l+6+l
or,
d+2l = 120
2d2l = 18
Add these to get
3d = 138
d = 46
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