1. 10+70-30=50
2. 14+60-3*10=14+60-30=44
3. 5*10+10*10+8*10+10*4=50+100+80+40=270
4. Mai intai vom afla cat a prins zilnic
10/7=1,(428557)
Acum vom afla cat a prin pe luna inmultind cu 30
1,(428557)*30=42,(857142)
A doua varianta mai simpla ar fi in cazul in care am considera ca luna are patru saptamani
10*4=40
5. 10*(9-4)=10*5=50
2*4*10=8*10=80