Question

If 99x+ 101y= 400 and 101x+ 99y= 600,then x+y is

Answer 1

See I will give u the method as its very simple

add both equations then

and u will get the answer

If any doubt then please see the way dow

$99x + 101y = 400$
$101x + 99y = 600$
Add them
$200x + 200y = 1000$
$200(x + y) = 1000$
$x + y = 1000 \div 200$
$x + y = 5$
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