This problem is much easier to solve than many learners think. It's simply a question of singular and plural. If the noun is plural ( biscuits, books, countries, children, men ), then you have to use 'Many'. It's obvious from the 's' at the end at the end of 'biscuits' that this is a plural word, isn't it? If the noun is singular ( money, luggage, tea ) , then you have to use 'Much'. It really is that simple.

How many biscuits ?

remember you can not say "many money", becouse money is uncounted. so...much many, not many money(="moni moni"(with horrible pronounciating) noooooooo!!!!! no mani momi=no moni moni=no mini mini.) you can imaging a person very baaaad speaking english and that person saing incorrect "mony mony", so automatically in any moment you can remeber this and you will know this is incorrect! wron! and you will know always that money is uncountabe. and that rull will always with you even you ´d forgot that. sorry for my English but its really very good tip, It always works

much для неисчисляемых существительных