how much mana should i put in a 60 card magic deck

[Mana]

how much mana should i put in a 60 card magic deck?

[klicker]

Depending on the type of deck, generally you should play with 20 to 24 lands

[SugarBlossom13]

do you mean 20 of the 60 cards in your deck should be land? (depending on your deck of course!)

[Arix]

The general rule is that 40% should be lands, so for a 60 card deck, that means 24 of those cards should be lands.