Răspunsuri

2014-08-11T15:10:40+03:00
Notam suma cu x 
Prima data : 
Cheltuie : 1/4 *x
Ramane : 3/4 *x = y
A doua data :
Chelltuie : 1/6 * y
Ramane: 5/6 * y = z
A treia data:
Cheltuie : 1/3 * z + 120
Ramane : 2/3 * z - 120 =600 => 2/3 * z = 720 => z = 720 *3 /2 => z= 1080
5/6 * y = z = 1080 => y = 1080* 6 /5 = 1296
3/4 * x = 1296 => x = 1296 * 4 /3 => x= 1728 
Sper ca ai inteles :)