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--> 20-15= 5
jadi,,
bilangan cacah 1 = 20
bilangan cacah 2= 15
jawab : 20×15 = 300
a+b = 35
a - b = 5 +
2a = 40
a = 40/2
a = 20
a+b = 35
b = 35-20
b = 15
Hasil kali = 20 x 15 = 300