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Bil. 1 = x
Bil. 2 = y
Maka,
x +y = 20
x = 6 +y
x +y = 20
(6 +y) +y = 20
6 +2y = 20
2y = 20 -6
2y = 14
y = 14/2
y = 7
x = 6 +y
= 6 +7
= 13
Maka,
hasil kali bilangan itu
x . y
= 13 . 7
= 91
Itu jawabannya.