Answer:
72
Explanation:
18 times 4 equals 72. If there are 4 students in EACH row out of all the 18, then there is 72 kids on the bus.
*The part about how many books per student is irrelevant to the question*
All you need to do is multiply 18 rows by 4 students per row.
18 * 4 = 72 total students on bus
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