Question

Zadanie 1

CP=?
ms=5
mr=20
zadanie 2

cp=15
ms=3
mr=?
zadanie 3

cp=30
ms=x
mr= x + 10

Answer 1

1 .
Cp=?
Cp= ms/mr * 100%
Cp = 5/20*100%
Cp=25%

2.
mr=?
mr=ms*100%/Cp
mr=3*100%/15
mr=20

3.

cp=ms/mr*100
ms=cp*mr:100
x=30*(x+10):100
x=0,3(x+10)
x=0,3x+3
x-0,3x=3
0,7x=3 /:0,7
x=3/0,7
x=30/7
ms=4i2/7

ms=30/7
mr=30/7+10
mr=14i2/7

Answer 2

Zadanie 1

CP=?
ms=5
mr=20

cp=ms/mr*100
cp=5/20*100
cp=0,25*100
cp=25

zadanie 2

cp=15
ms=3
mr=?

cp=ms/mr*100
mr=ms/cp*100
mr=3/15*100
mr=0,2*100
mr=20

zadanie 3

cp=30
ms=x
mr= x + 10

cp=ms/mr*100
ms=cp*mr:100
x=30*(x+10):100
x=0,3(x+10)
x=0,3x+3
x-0,3x=3
0,7x=3 /:0,7
x=3/0,7
x=30/7
ms=4i2/7

ms=30/7
mr=30/7+10
mr=14i2/7