Răspuns:
notăm x turistul
Prima zi:
[tex]x = \frac{30}{100} \times x = >x = \frac{30x}{100} [/tex]
Total
[tex] \frac{x}{1} - \frac{30x}{100} = 21 = > \frac{100x}{100} - \frac{30x}{100} = \frac{2100}{100} = > 100x - 30x = 2100 = > 70x = 2100 = > x = 2100 \div 70 = > x = 30km[/tex]
In a doua zi: x-30x/100=21
