Billy 0.3 1.5 = 4.2 x 2 1:4 = 10 1:x

1.5/0.3=x/4.2
0.3x=1.5*4.2
x=1.5*4.2/0.3
x=21
(1/2)：4=（1/10）：x
(1/2)x=4*1/10
x=(4*1/10)/(1/2)
x=4/5

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