Qn.1
x+y=31.5
x-y=5.25
x=5.25+y
5.25+y+y=31.5
2y=31.5-5.25
2y=26.25
y=13.125
x=5.25+13.125=18.375
Ans: 13.125 & 18.375
Qn.2
r+s=842
r-s=314
r=314+s
314+s+s=842
2s=842-314
2s=528
s=264
r=314+264=578
Ans:264&578
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