A) 10
B) 46
C) 70
D) 90
Correct Answer: A
Solution :
\[x+y=100\] \[xy=\text{ }495\times 5=2475\] \[\therefore \]\[{{(x+y)}^{2}}-4xy={{(x-y)}^{2}}=1000\] \[\left[ \because \,\,{{\left( x+y \right)}^{2}}-4xy={{\left( x-y \right)}^{2}} \right]\] \[{{(x+y)}^{2}}-4xy=10000-9900\] \[{{(x-y)}^{2}}=100\] \[\therefore \] \[x-y=10\]You need to login to perform this action.
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