Answer:
200 math textbooks and 136 biology textbooks were sold
Explanation:
We can determine how many text books of teach type were sold using a system of equations, where,
- M represents the number of math textbooks,
- and B represents the number of biology textbooks.
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First equation:
Since the sum of the math and biology textbooks equals 336 (i.e., the combined total of textbooks sold), our first equation is given by:
M + B = 336
Second equation:
Since the number of biology textbooks sold was 64 less than the number of math textbooks, our second equation:
B = M - 64
Method to solve: Substitution:
Solving for M:
We can first solve for M by substituting M - 64 for B in the first equation:
M + M - 64 = 336
(2M - 64 = 336) + 64
(2M = 400) / 2
M = 200
Thus, 200 math textbooks were sold.
Solving for B:
Now we can solve for B by plugging in 200 for M in the second equation:
B = 200 - 64
B = 136
Thus, 136 math textbooks were sold.