In what ratio should a 20% methyl alcohol solution be mixed

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IB ACIO Grade II Previous Paper 3 (Held On: 15 Sept 2013
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In what ratio should a 20% methyl alcohol solution be mixed with a 50% methyl alcohol solution so that the resultant solution has 40% methyl alcohol in it?

[IB ACIO Grade II Previous Paper 3 (Held On: 15 Sept 2013]

A

1 ∶ 2

B

2 ∶ 1

C

1 ∶ 3

D

2 ∶ 3