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Help would be appreciated :)

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If x and r are directly proportional and x = 5 when r = 25, then what is x when r = 40?

Apr 19, 2021

#1
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I'm pretty sure the answer is 8, because when r = 25 and x = 5, you have to divide r by 5 to get x. This way, because 40/5 is 8, I think that would be the answer you're looking for.

So x = 8.

Apr 19, 2021
edited by Guest  Apr 19, 2021
#3
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Guest Apr 19, 2021
#5
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Lol I'm so sorry, I meant x = 8, not r = 8. I fixed it in the post now :)

Guest Apr 19, 2021
#6
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Ok thx it's correct :)

Guest Apr 19, 2021
#2
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x and r are directly proportional means we can write;  x = k*r where k is a constant.

To find k use the fact that x = 5 when r = 25, so   5 = k*25 .  You should be able to find k from this.

Then use that to find x when r is 40:  x = k*40

Apr 19, 2021
#4
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SO x = 8?

Guest Apr 19, 2021
#7
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If x and r are directly proportional and x = 5 when r = 25, then what is x when r = 40?

x : r = 5 : 25

5 : 25 = x : 40

x = (5 * 40) / 25

x = 8

Apr 19, 2021