Question

a)5/x din 80 este 100
b)17/x din 280 este 153
c)10/x din 31 este 30
d)34/x din 4 800 este 13 600
Dau coroana help!

Answer 1

(5/x)*80=100 => 400/x=100 => x=4
17/x *280 =153 => 4760/x=153 => x=4760/153
10/x *31=30 => 310/x = 30 => x=310/30 => x=31/3
34/x *4800 =13600 => 163200/x=13600 => x=16300/13600 => x=12

Answer 2

5/x *80=100⇒(5*80)/x=100
400/x=100 ⇒100x=400⇒x=400:100 ⇒x=4
b) 17/x *280=153 ⇒(17*280)/x=153 ⇒4760/x=153 ⇒153x=4760 ⇒x=4760/153
c)10/x*31=30 ⇒(10*31)/x=30 ⇒310/x=30 ⇒30x=310 ⇒ x=310/30⇒x=31/3
d) 34/x*4800=13600 ⇒(34*4800)/x=13600 ⇒163200/x=13600 ⇒13600x=163200
 x=163200:13600 ⇒x=12