(     )+9=13

(     )+13=17

(     )+1=18

(     )+3=20

(     )+7=19

(     )+2=17

(     )+2=20

(     )+8=19

(     )+6=15

(     )+1=15

(     )+3=18

(     )+6=11

(     )+9=19

(     )+5=16

(     )+12=20

(     )+4=15

(     )+10=11

(     )+16=20

(     )+1=20

(     )+9=19

(     )+4=20

(     )+5=19

(     )+2=17

(     )+9=13

(     )+10=16

(     )+3=20

(     )+4=14

(     )+11=18

(     )+3=20

(     )+0=17

(     )+11=16

(     )+5=16

(     )+1=20

(     )+2=19

(     )+11=15

(     )+16=20

(     )+12=15

(     )+5=17

(     )+3=18

(     )+2=17

(     )+1=19

(     )+19=20

(     )+2=19

(     )+1=16

(     )+0=19

(     )+9=12

(     )+15=19

(     )+13=13

(     )+10=11

(     )+4=20