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Dupa ce a cheltuit in prima zi 0.4 dintro suma de bani iar in a doua zi o treime din ceea ce ia ramas. Damian mai poate cheltui 60 lei. Ce suma a avut initial?

Sagot :

fichoh

Răspuns:

150 Lei

Explicație pas cu pas:

Fie suma inițială = x

Cheltuieli în prima zi = 0,4x

Cheltuieli pentru a doua zi = 1/3 (x - 0,4x)

Suma rămasă = 60

x = 0,4x + 1/3 (0,6x) + 60

x = 0,4x + 0,2x + 60

x = 0,6x + 60

x - 0,6x = 60

0,4x = 60

x = 60 / 0,4

x = 150 Lei

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