SOLUTION: if the food for 15 people lasts in 210 days after 10 days 15 members are added then the food will last for how many days

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Question 921442: if the food for 15 people lasts in 210 days after 10 days 15 members are added then the food will last for how many days
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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if the food for 15 people lasts in 210 days
amt of food available as measured in people-days
15 * 210 = 3150
:
after 10 days 15 members are added then the food will last for how many days
let d = no. of days after 15 members are added, then a total of 30 members
15*(10) + 30d = 3150
150 + 30d = 3150
30d = 3150-150
30d = 3000
d = 3000/30
d = 100 days after 15 more were added