To answer the equation first, let x be the number of pens. With this representation, the number of pencils she bought would be x - 4. The total amount she would have to spent for all the items is,
T = 6.70x + 3.5(x - 4)
|2x-3| + 1 = 6
1) |2x-3| + 1 (-1) = 6 (-1)
2x-3 = 5
2) 2x-3 (+3) = 5 (+3)
2x = 8
3) 2x(/2) = 8(/2)
x = 4
Answer:
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Step-by-step explanation:
You can set up a proportion for this problem. Let the total number of books = x
The number of non-fiction books to the total number of books is
3/(7 + 3) books = 3/10
3/10 = 240/x Cross multiply
3x = 240 * 10 Combine the right
3x = 2400 Divide by 3
3x/3 = 2400/3 Divide
x = 800
Answer: 800 books in total.
