In the store,
16 of the books sold were Chinese books.
15 of the remaining books sold were English books. The ratio of the number of English books sold to the number of Math books was 7 : 10. The number of Science books sold was 90. How many books were sold altogether?
| Chinese |
Remaining books |
Total |
| 1x7 |
5x7 |
6x7 |
| |
English |
Math |
Science |
|
| |
1x7 =
7 u |
4x7 =
28 u |
|
| |
7 |
10 |
|
|
| 7 u |
7 u |
10 u |
18 u |
42 u |
The number of English books is repeated. Make the number of English books the same. LCM of 1 and 7 is 7.
Number of Science books = 18 u
18 u = 90
1 u = 90 ÷ 18 = 5
Total number of books sold
= 42 u
= 42 x 5
= 210
Answer(s): 210
