Question

plz dau 100 p ex 9/10

Answer 1

5pompe....10 ore
4pompe... x ore
x=5*10/4=40:5=8ore.(la 9)

5tractoristi.....9 zile...300ha
3tractoristi... x zile.... 800 ha
x=9*800/300= 24 zile

Answer 2

9)
4 pompe............................10 ore
5 pompe............................ x ore
x=4x10:5=40:5=8 ore
10)
5 tractoristi.........................9 zile.......................300 ha
3 tractoristi........................ x zile.......................800 ha
x=800x9:300=7200:300=24
R:Pentru a ara 800 ha , 3 tractoristi  trebuie sa lucreze 24 zile .