Bradley Garrett
07/26/2023 · Elementary School
1.23 For åtte år siden var Espen halvparten så gammel som han vil være om fire år. Hvor gammel var Espen for fire år siden?
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Tutor-Verified Answer
Step-by-step Solution
La oss si at Espen er \( x \) år gammel nå.
Vi vet at for åtte år siden var Espen halvparten så gammel som han vil være om fire år. Dette kan uttrykkes som:
\[
x - 8 = \frac{1}{2}(x + 4)
\]
Vi kan nå løse denne ligningen for å finne ut hvor gammel Espen var for fire år siden.
Solve the equation by following steps:
- step0: Solve for \(x\):
\(x-8=\frac{1}{2}\left(x+4\right)\)
- step1: Multiply the terms:
\(x-8=\frac{1}{2}x+2\)
- step2: Move the variable to the left side:
\(x-8-\frac{1}{2}x=2\)
- step3: Subtract the terms:
\(\frac{1}{2}x-8=2\)
- step4: Move the constant to the right side:
\(\frac{1}{2}x=2+8\)
- step5: Add the numbers:
\(\frac{1}{2}x=10\)
- step6: Multiply by the reciprocal:
\(\frac{1}{2}x\times 2=10\times 2\)
- step7: Multiply:
\(x=20\)
Espen er nå 20 år gammel.
For å finne ut hvor gammel Espen var for fire år siden, trekker vi fra 4 fra 20:
\( 20 - 4 = 16 \)
Så Espen var 16 år gammel for fire år siden.
Quick Answer
Espen var 16 år gammel for fire år siden.
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