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
