Answer :

AL2006
The constant of proportionality is 4 .

The equation is  [ Height = (4) times (Days) ] .

When the sunflower is 60cm tall,                60 = (4) times (Days).

Divide each side of the equation by 4:       15  =  Days
itwould be the 25 day the sunflower would be 60 cm tall

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