Question

a)Cat la suta reprezinta 15 din 60?
b)Cat la suta reprezinta 2.8 din 14?

c)Cat la suta reprezinta 5supra7 din 2?

Answer 1

a) 60......100%
     15........x%
      x = 15x100/60 = 25%

b) 14...........100%
     2,8............y%
     y = 2,8x100/14 = 280/14 = 20%

c) 2..............100%
    5/7.............z%
    z = 5/7 x 100/2 = 5/7 x 50 = 250/7 = (245+5)/7 = (35 si 5/7)% = 35,71%

Answer 2

60......100 %
15........  x %     

x = 15·100/60 = 25 %


14...........100 %
2,8..............x %     

x = 2,8·100/14 = 20 %


2..............100 %
5/7.............  x %   

x = 5/7·100/2 = 5/7·50 = 250/7 ≈ 35,71 %