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Verified answer
misal
tangki kayu = a
bola = b
a+b= 1 dolar 10 sen
a = 1 dolar + b
subtitusikan
(1 dolar + b ) + b = 1 dolar 10 sen
1 dolar +2b = 1dolar 10 sen
2 b = 1 dolar 10 sen - 1 dolar
2b = 10 sen
b= 5 sen
jadi harga bolanya 5 sen
semoga mmbantu