[ikariotis]

If a person consumed 100 ml of 50% methanol and we want to slow down his metabolism with an antidot for instance ethanol by wine that with 13% ethanol. How much wine do we need to slow down the oxidation rate of methanol to 5% (ethanol and methanol distribtes equal in body fluids) before consuming the wine.

[Borek]

You have to show your attempts at solving the question to receive help. This is a forum policy.

It is about simple ratios - methanol and ethanol are oxidized by the same metabolic pathway, so you have to add enough ethanol to make sure methanol makes 5% of the sum of ethanol and methanol.

[Babcock_Hall]

Were you given any additional information?  This problem has some subtleties.