Răspuns:
1. Tatal :7×5= 35ani
Bunicul: 7×9=63ani
Impreuna: 7+35+63=105ani
2. in prima zi:4×25=100
in a doua zi: 5×20=100
In total: 100+100=200
3. 2×1500=3000
6900-3000=3900
deci au mai ramas 3900 de lemne
