So if everyone spends X yuan on a meal, then this problem can be easily solved by making a simple one-dimensional equation.

That is, A has 29 days, and the cost of two meals a day is: 29 × 2 × X=58X.

Take 2 1 day, and the cost of a meal every day is: 21×1× x = 21x.

The total expenditure is1378 = 29× 2× x+2/kloc-0 /×/kloc-0 /×

Solving x and bringing it back is tedious, but the idea is the simplest.

The second type: use proportion to calculate. Since the money spent on each meal is the same, it is the proportion of consumption in terms of the number of meals. That is, the proportion of eating is the proportion of consumption. If there is 58:2 1, then A should pay1378× 58/(58+21) =101.7.

B1378× 21(58+21) = 366.3.

So learn the proportion well, do the problem quickly and apply it conveniently.

Thank you for adopting ~