Answers

2014-08-12T18:25:11+05:30
Let Radha got X
So, (16+25+X)/3=19
So X=16
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2014-08-12T18:39:16+05:30
Let us assume that radha got x marks
marks of lakshmi=16
marks of sita=20
accoeding to problem,
16+25+x/3=19
41+x=57
x=16
0
we know that average = sum / no. of quantities