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It means thrifty or economic in the spending of money, e.g., a frugal meal is an economical meal, just the right quantity without any waste.
Not wasteful;
Depending on the restaurant, hours, quantity, quality, specific meal, etc.; the minimum is probably 2,5 euros. And the maximum up to 25 euros.
Depends on menu quantity one selects. However 20 Euros is somehow good
There is no standard collective noun for a group of meals or a quantity of meal (a mass noun for grain).
Collective nouns are an informal part of language; any noun that suits the situation can function as a collective noun; for example: