Some notebooks and pencils were packed into yellow and black packets. There were 7 more yellow packets than black packets. Each yellow carton contained 9 notebooks and each black carton contained 20 pencils. Given that there were 25 fewer notebooks than pencils in total, how much notebooks were there?
| |
Notebooks in
yellow packets |
Pencils in
black packets |
Difference |
| Number |
1 u + 7 |
1 u |
|
| Value |
9 |
20 |
|
| Total value |
9 u + 63 |
20 u |
25 |
Number of fewer notebooks than pencils
= 20 u - (9 u + 63)
= 20 u - 9 u - 63
= 11 u - 63
11 u - 63 = 25
11 u = 63 + 25
11 u = 88
1 u = 88 ÷ 11 = 8
Total number of notebooks
= 9 u + 63
= 9 x 8 + 63
= 72 + 63
= 135
Answer(s): 135
