Question 309570
XY=40
1*40=49 (40+1)/2=41/2=20.5 NOT AN ANSWER.
2*20=40 (2+20)/2=22/2=11 WHOLE NUMBER FOR X & Y AND AN ODD NUMBER FOR THE MEAN.
4*10=40 (4+10)/2=14/2=7 DITTO.
5*8=40 (5+8)/2=13/2=6.5 NOT AN ANSWER.
ANSWER IS (B)2