Question

Calculati:
a)30% din 1200000
b)timpul in care 8 muncitori termina o lucrare stiind ca 10 muncitori termina aceeasi lucrare in 5 ore.

Answer 1

$a)~ \frac{30}{100} \cdot 1200000= 360000. \\ \\ b)~10~muncitori.............................5~ore \\ ~~~~~8~muncitori..............................x~ore \\ ~~~------------------(proportionalitate~inversa) \\ ~~~x= \frac{10 \cdot 5}{8}=6~ore+ \frac{1}{4}~ore=6 ~ore~si~15~minute.$

Answer 2

30/100*1 200 000=
3*1 200 000/10=
3*120 000= 
=360 000

10 muncitori.............5 ore
8 muncitori..............x

x=10*5/8
x=50/8
x=6.25 ore