they are making the earth ground and water polluted.It affects everything in the environment
Answer:
There were 226 chemistry books and 166 history books.
Explanation:
Let there are x chemistry books and y history books.
ATQ,
x + y = 392 ....(1)
The number of chemistry textbook sold was 60 more than the number of history textbook sold.
x = 60+y
or
x - y = 60 ....(2)
Adding equation (1) and (2).
2x = 392 + 60
2x = 452
x = 226
Put the value of x in equation (1).
226 + y = 392
y = 392-226
y = 166
Hence, there were 226 chemistry books and 166 history books.
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