The average of a,b,c is 20 and that of b,c,d is 25; if d=30, then the value of a is
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a + b + c = 20
3
a + b + c = 60
b + c + d = 25
3
b + c + 30 = 75
b + c = 75 - 30 = 45
a + b + c = 60
a + 45 = 60
a = 60 - 45 = 15
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