1. 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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By: anil on 05 May 2019 01.50 am
Average of a,b,c = 20 => Sum = $$a+b+c=3 imes20=60$$ ----------(i) Similarly, sum of b,c,d = $$b+c+d=3 imes25=75$$ -----------(ii) Also, $$d=30$$ Substituting it in equation (ii) => $$b+c=75-30=45$$ Again substituting above value in equation (i), we get : => $$a+45=60$$ => $$a=60-45=15$$ => Ans - (D)
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