[ Word problems ]

In a pet store, they sell large and small birds. A large bird costs twice as much as a small one. One lady bought 5 large birds and 3 small ones, while another bought 5 small birds and 3 large ones. In this case, the first lady paid 20 rubles more. How much does each bird cost?

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Try to express the difference in purchases of two ladies "in small birds".

## Solution

The first lady paid for her purchase as if for 13 small birds (let's recall that a large bird is twice as expensive as a small one), while the second lady paid as if for 11 small birds. That is, the difference in purchases is 2 small birds, and the difference in price is 20 rubles. Therefore, a small bird costs 10 rubles, and a large bird costs 20 rubles.

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