# Tonic

One package tonic consume Mom 12 weeks and daughter for 14 weeks. 4 weeks they use the same cream together and then only daughter. How many weeks endured tonic to daughter then?

Correct result:

x =  5.3333 t

#### Solution:

4(1/12+1/14)+x/14 = 1

4•(1/12+1/14)+x/14 = 1

6x = 32

x = 163 ≈ 5.333333

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