Question

Doar cele incercuite repede va Rog!

Answer 1

1.

din x/y=3/7 facem x/3=y/7

din y/z=7/12 facem y/7=z/12

x/3=K ⇒ x=3K

z/12=K ⇒ z=12K

3K/12k=0.25K ⇒ x/z=0.25K

2.

x/y=5/1

y=12.4 ⇒ x/12.4=5/1

x=12.4*5

x=62

8.

(40/240)*100=16,6%

0.1(6)*100=16,6%

11

6% din 800=6/100 *800

=6/1*8

=48

800-48=752

12.

7% din 1100= 7/100*1100

=7/1*11

=77

1100+77=1177