Toothpaste 27001

The father would use the toothpaste alone for 15 days, the mother for 12 days, and the daughter for ten days. It was used by all three for three days, then only the father and mother. How many days have they used it since the beginning of its use?

Correct answer:

t =  4.6667

Step-by-step explanation:


3/15+3/12+3/10 + (t-3)·(1/15+1/12) = 1

9t = 42


t = 42/9 = 4.66666667

t = 14/3 ≈ 4.666667

Our simple equation calculator calculates it.



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