Vanskelig matte oppgave!

[IkKe123]

En fiskeoppdretter vil finne ut omtrent hvor mange fisker han har i anlegget sitt, han merker 100 fisker og setter dem ut i anlegget igjen. Etter en tid fanger han 200 fisker, 8 av dem er merket.

Anslå hvor mange fisker det er i anlegget.

 

Kunne du forklart hvordan man løser en slik oppgave?

 

 

 

Takk på forhånd.

[Intox]

Er ikke sikker på dette, men jeg ville tro at siden han slipper ut 100 fisker, og 8 er 4% av de 200 han fanger igjen må 100 være 4% av totale fisker ergo 2500 fisker? Blir jo ikke nøyaktig uansett i en ekte situasjon selv om dette er rett tenke måte men. Høres dette logisk ut eller?

[Janhaa]

Er ikke sikker på dette, men jeg ville tro at siden han slipper ut 100 fisker, og 8 er 4% av de 200 han fanger igjen må 100 være 4% av totale fisker ergo 2500 fisker? Blir jo ikke nøyaktig uansett i en ekte situasjon selv om dette er rett tenke måte men. Høres dette logisk ut eller?

stemmer det...

[IkKe123]

Er ikke sikker på dette, men jeg ville tro at siden han slipper ut 100 fisker, og 8 er 4% av de 200 han fanger igjen må 100 være 4% av totale fisker ergo 2500 fisker? Blir jo ikke nøyaktig uansett i en ekte situasjon selv om dette er rett tenke måte men. Høres dette logisk ut eller?

 

 

riktig svar som fasiten, taaaaakkkk!!!

[IkKe123]

Er ikke sikker på dette, men jeg ville tro at siden han slipper ut 100 fisker, og 8 er 4% av de 200 han fanger igjen må 100 være 4% av totale fisker ergo 2500 fisker? Blir jo ikke nøyaktig uansett i en ekte situasjon selv om dette er rett tenke måte men. Høres dette logisk ut eller?

 

 

men hvordan fant du ut 2500 ? kan du forklare litt mer nøyaktigere?

[Dr. Brodsky]

8 av 200 er det samme som 4%, altså 4 av 100. For at du skal finne igjen alle de merkede fiskene må du altså fange 25 "grupper" med fisk. 4 * 25 er 100. 25 grupper på 100 fisk hver = 2 500.

 

Merker at dette var en dårlig forklaring, men det var sånn jeg tenkte og det gikk mistenkelig mye raskere i hodet enn det gjorde å skrive det ned på en fornuftig måte.

[IkKe123]

8 av 200 er det samme som 4%, altså 4 av 100. For at du skal finne igjen alle de merkede fiskene må du altså fange 25 "grupper" med fisk. 4 * 25 er 100. 25 grupper på 100 fisk hver = 2 500.

 

Merker at dette var en dårlig forklaring, men det var sånn jeg tenkte og det gikk mistenkelig mye raskere i hodet enn det gjorde å skrive det ned på en fornuftig måte.

 

 

forsto mer nå, men hvorfor akkurat 25 grupper ? hvordan fant du ut det a?

[Dr. Brodsky]

Siden 4 av 100 fisker er merket, og han skal finne igjen alle de merkede fiskene. 4 går 25 ganger i 100.

 

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Hver strek er en fisk. Tykk strek er en merket fisk. Så da er det bare å telle. 100 tykke streker og 2 500 til sammen. Altså; 4% av strekene er tykke.

Endret 18. oktober 2011 av Må jeg?

[IkKe123]

Siden 4 av 100 fisker er merket, og han skal finne igjen alle de merkede fiskene. 4 går 25 ganger i 100.

 

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Hver strek er en fisk. Tykk strek er en merket fisk. Så da er det bare å telle. 100 tykke streker og 2 500 til sammen. Altså; 4% av strekene er tykke.

 

 

 

AHA!! takk skal du ha!!

[Intox]

Annen måte å tenke på det er prosentvis - Hvor mange ganger går 4 % i 100%? 25 ganger, 25 ganget med de 100 fiskene han satt ut = 2500. Fant ut at det allerede er forklart, flott at du tar deg såpass mye tid til å forklare

Endret 19. oktober 2011 av Intox