Mary

Mary is 12 years old, which is 40% of the age of her mother. How many percent of her mother's age will Mary have after the next 12 years?

Correct result:

p =  57.1429 %

Solution:

 12=0.40 m  0.4m=12  m=30  p=100 12+12m+12=100 12+1230+12=4007=57.1429%



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