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= 14 x 8 = 112
diketahui total data = 15+13+12+x+y+16+20+18 = 112
maka
x+y = 112 -12 - 15 -13 - 16 - 20 - 18
= 100 - 15 - 13 - 16 - 20 - 18
= 85 - 13 - 16 - 20 - 18
= 72 - 16 - 20 - 18
= 56 - 20 - 18
= 36 - 18
= 18
jadi, x+y = 18