Harvest time

Grandma and granddaughter Julka reap currants in 15 hours of working together. Julka herself would have currants ten days after 6 hours of work a day.
Find by what percentage the grandma's harvest time was shortened when the granddaughter was involved in the current harvesting.

Correct answer:

p =  25 %

Step-by-step explanation:

j=10 6=60 h  15/b + 15/j = 1 15/b + 15/60 = 1 15/b=115/60=43=0.75 b=115/6015=20 h  p=100 bb15=100 202015=25%

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