Question

1) Resolva as seguintes proporções:
a) x/5=21/35
b)3/4/1/5 =90/x
c)9/13=x/26
d)1/7=x-6/49
e)2x+1/10=-21/30
f)3x+2/x+3=-40/25
g)0,3/x=-6/9
h)0,2/5=x/200

Answer 1

a) x/5=21/25 -> 25x= 5x21 -> x= 105/25 -> x=4,2
b) 3/4 / 1/5 = 90/x -> 3*5 /4*1 = 90/x -> 15x=4*90 -> x= 360/15  ->x= 24
c) 9/13 = x/26  -> 9x26 =13x -> x = 234/13 -> x= 18

ok. vc agora observa e complete as outras letras...