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19 December, 19:04

Assume that y varies directly with x, then solve if y=12 when x=15, find x when y=21

and can someone explain to me how they got the answer because i got 16.8

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Answers (2)
  1. 19 December, 21:30
    0
    If y is 12 when x is 15 that means that x is 3 more than y. x=y+3 so when y is 21, x=21+3 so x=24
  2. 19 December, 22:54
    0
    24 beacuse x is 3 more than y
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