Question

В магазине продаётся 720 поздравительных открыток,причем новогодних в три раза меньше чем остальных. сколько новогодних открыток в магазине

Answer 1

1) 3+1=4(части)-кол-во частей
2)720:4=180(открыток)-новогодние

Answer 2

Calculating the Number of New Year's Cards in the Store

To calculate the number of New Year's cards in the store, we can use the following approach:

Let's denote the total number of cards as T and the number of non-New Year's cards as N. Given that the number of New Year's cards is three times less than the number of non-New Year's cards, we can express the relationship as:

N = 3 * (T - N)

Solving this equation will give us the number of non-New Year's cards, and then we can calculate the number of New Year's cards.

Calculation

Let's solve the equation:

N = 3 * (T - N)

Expanding the equation:

N = 3T - 3N

Bringing N to one side of the equation:

4N = 3T

Solving for N:

N = 3T / 4

So, the number of non-New Year's cards is three-fourths of the total number of cards.

Conclusion

Therefore, the number of New Year's cards in the store can be calculated as:

T - N = T - 3T / 4 = T / 4

So, the number of New Year's cards in the store is one-fourth of the total number of cards.

Hence, the number of New Year's cards in the store is 1/4 of the total, which is 720.

Therefore, the number of New Year's cards in the store is 180.