Odpowiedzi

2009-10-08T14:38:16+02:00
A) 13% to 18,2 kg

Układamy proporcję:
13 %- 18,2 kg
100 % - x ; mnożymy na krzyż

13%*x= 18,2 kg*100%/:13%
x= 1820/13kg
x= 140 kg

b) 33 1\3 to 18 dm

33 1/3% - 18 dm
100 % - x
33 1/3 %*x= 1800%*dm/:33 1/3 %
x= 54 dm
c)125% to 3h 30 min , gdzie 3h 30 min= 180 min +30 min=210 min

125 %- 210 min
100%- x

125%*x = 21000min*%/125%
x= 168 min= 2 h 48 min
2009-10-08T14:45:20+02:00
A) 13% to 18,2 kg = 140
b) 33 1\3 to 18 dm - 54
c)125% to 3h 30 min = 2h 48min
2009-10-08T14:47:00+02:00
A) 13% to 18,2 kg

proporcja
13 %- 18,2 kg
100 % - x ;

13%*x= 18,2 kg*100%/:13%
x= 1820/13kg
x= 140 kg

b) 33 1\3 to 18 dm

33 1/3% - 18 dm
100 % - x
33 1/3 %*x= 1800%*dm/:33 1/3 %
x= 54 dm

c)3h 30 min= 180 min +30 min=210 min
125% to 3h 30 min
125 %- 210 min
100%- x

125%*x = 21000min*%/125%
x= 168 min= 2 h 48 min