Question

plz answer both the questions

Answer 1

first one ,
x+y=15............a
x-y=3................b

adding both equations
2x=18
or x =9;
thus y = 6;
product of both will be 9*6=54

second one ,
x+y =200 { let x is the number of correct ques .and y is incorrect ques}
4x-y=200
adding both eqns
5x=400
or
x=80
thus
y =120..

Mark it brainliest if it helps you ...:)