When 18 boys joined a group of why students, the ratio of boys to girls in the group became 4 : 5. Write an algebraic expression

Question

azamat

3 years ago

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When 18 boys joined a group of why students, the ratio of boys to girls in the group became 4 : 5. Write an algebraic expression

for the number of girls in terms of Y.

Mathematics

1 answer:

expeople1 [14] · Answer 1 · 2022-02-24T20:37:34+03:00

18 /(y + 18) = 4/9 <<<<===== answer.
be careful the number of boys is in a ratio of the number of boys to the total.
Just to make sure I'm right, I solve it.
18 * 9 = 4*(y + 18)
162 = 4y + 72 Subtract 72 from both sides.
90 = 4y Divide by 4
22.5 = y Never mind the 0.5. Does it work

18/22.5 = 0.8
0.8 is the same thing as 4/5
The problem makes no sense in the real world, but it does work out mathematically.