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3 years ago

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If working together, brothers Tom and Jack can paint a wall in 4 hours, how much time would it take Jack to paint the wall alone

? (1) Jack is painting twice as fast as Tom. (2) If Tom painted twice as fast as he actually does, the brothers would finish the work in 3 hours.

1 answer:

kiruha [24]3 years ago

3 0

T+J=4 hours
x+2x=4 hours
3x=240 minutes
X=80 minutes

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3 years ago

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3 years ago

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kiruha [24]

Answer:

1

Step-by-step explanation:

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2 years ago

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klemol [59]

Answer:

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Step-by-step explanation:

Given the expression

$\left(-t^4\:-5t^3\:-10t^2\:\right)+\left(9t^3\:+3t^2\:-1\right)$

Remove parentheses: (a)=a

$=-t^4-5t^3-10t^2+9t^3+3t^2-1$

Group like terms

$=-t^4-5t^3+9t^3-10t^2+3t^2-1$

Add similar elements

$=-t^4-5t^3+9t^3-7t^2-1$ ∵ $-10t^2+3t^2=-7t^2$

Add similar elements

$=-t^4+4t^3-7t^2-1$ ∵ $-5t^3+9t^3=4t^3$

Thus, the equivalent expression in simplified form:

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Ad libitum [116K]

Answer:

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2 years ago

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