gigi1103
  • gigi1103
Each car in a rental fleet is either red or white, and there are 75 cars total. There are three more white than twice the number of red cars. How many cars are white?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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gigi1103
  • gigi1103
@beckyg111
gigi1103
  • gigi1103
@Kitten_is_back
gigi1103
  • gigi1103
@Nnesha

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gigi1103
  • gigi1103
help plz
Vocaloid
  • Vocaloid
well, let's let r = number of red cars and w = number of white cars we can write two equations using the information in the problem r + w = 75 w = 2r + 3 know where to go from here?
gigi1103
  • gigi1103
?
Vocaloid
  • Vocaloid
well, ok, I'll walk you through step by step like the problem says, there are 75 total cars, so r + w = 75 does that make sense?
gigi1103
  • gigi1103
yes
Vocaloid
  • Vocaloid
the problem also says "there are three more white than twice the number of red cars" so w = 2r + 3 with me so far?
gigi1103
  • gigi1103
yup
Vocaloid
  • Vocaloid
so we put them together: r + w = 75 w = 2r + 3 now, the second equation says w = 2r + 3, so we can replace "w" with "2r+3" whenever we see w now, going back to the first equation we have: r + w = 75 r + (2r + 3) = 75 does that make sense?
gigi1103
  • gigi1103
yeah still with ya
Vocaloid
  • Vocaloid
ok, so we have r + (2r + 3) = 75 can you solve for r now?
gigi1103
  • gigi1103
so i divide by two
Vocaloid
  • Vocaloid
uh, not quite we have r + (2r + 3) = 75 let's combine the r's together r + 2r = ?
gigi1103
  • gigi1103
what do you mean?
Vocaloid
  • Vocaloid
just add them together r + 2r = ?
gigi1103
  • gigi1103
dang how?
gigi1103
  • gigi1103
they are numbers tho
Vocaloid
  • Vocaloid
r is just a letter that takes the place of a number think of it this way: one dog + two dogs = three dogs one r + 2r = 3r does that make sense?
gigi1103
  • gigi1103
yeah
gigi1103
  • gigi1103
so its 3rs now?
gigi1103
  • gigi1103
help?
Vocaloid
  • Vocaloid
right... r + 2r = 3r so far we have: 3r + 3 = 75 now subtract 3 from each side, what do you get?
gigi1103
  • gigi1103
these are the answers A) 24 B) 47 C) 48 D) 51
Vocaloid
  • Vocaloid
3r + 3 = 75 now subtract 3 from each side, what do you get?
gigi1103
  • gigi1103
how do you subtract on two sides?
gigi1103
  • gigi1103
???????????
Vocaloid
  • Vocaloid
there are two sides of the equation 3r + 3 and 75 we start off with 3r + 3 = 75 now we take away 3 from each side... 3r + 3 - 3 = 75 - 3 can you take it from here?
gigi1103
  • gigi1103
ok so 3-3=0 75-3=2 3r+0=72?
Vocaloid
  • Vocaloid
yeah! 3r = 72 now divide both sides by 3
gigi1103
  • gigi1103
ok one sec
gigi1103
  • gigi1103
24?
Vocaloid
  • Vocaloid
right, so r = 24 now, that means we have 24 red cars, now we can find the number of white cars using w = 2r + 3 so w = ?
gigi1103
  • gigi1103
5
gigi1103
  • gigi1103
5w
gigi1103
  • gigi1103
hello?
Vocaloid
  • Vocaloid
not quite... r = 24, so we replace "r" with "24" so w = 2r + 3 = 2(24) + 3 = ?
gigi1103
  • gigi1103
ok so 27
Vocaloid
  • Vocaloid
check your math again 2*(24) = 3 = ?
Vocaloid
  • Vocaloid
* means multiply
gigi1103
  • gigi1103
ok didnt see the times
gigi1103
  • gigi1103
51
gigi1103
  • gigi1103
@Vocaloid
Vocaloid
  • Vocaloid
right, so w = 51 and 51 is our answer
gigi1103
  • gigi1103
thanks!!
gigi1103
  • gigi1103
can you help with one more?

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