Question

Un drumet a mers in prima zi 30 % din drum , a doua zi 30℅ din rest si a treia zi restul , adica cu 7 km mai mult decat a doua zi . Cati km are drumul ?

Answer 1

1 zi:$\frac{30}{100}$ x drum
2 zi:$\frac{30}{100}$ x(drum - $\frac{30}{100}$ x drum)
3 zi:7 + $\frac{30}{100}$ x(drum - tex] \frac{30}{100} [/tex] x drum)
1zi +2zi+3zi=drum

$\frac{30}{100}$ x drum + $\frac{30}{100}$ x(drum - $\frac{30}{100}$ x drum) + 7 + $\frac{30}{100}$ x(drum - $\frac{30}{100}$ x drum)=drum