SOLUTION: At the start of the week a bookshop had science and art books in the ratio 2 to 5. By the end of the week, 20% of each type of books were sold and 2240 book of both type were unsol

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Question 1093862: At the start of the week a bookshop had science and art books in the ratio 2 to 5. By the end of the week, 20% of each type of books were sold and 2240 book of both type were unsold. How many books of each type were at the start of the week.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
At the start of the week a bookshop had science and art books in the ratio 2 to 5. By the end of the week, 20% of each type of books were sold and 2240 book of both type were unsold. How many books of each type were at the start of the week.
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Start DATA:
# of science books = 2x ; # of art books = 5x ; Total books = 7x
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Equation::
0.8(2x) + 0.8(5x) = 2240
0.8(7x) = 2240
x = 400
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Ans:: 7x = 7*400 = 2800 books at start of week
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Cheers,
Stan H.
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