72 and 100 is divisible by 2.
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87 is divisible by 1, 3, 29, and 87. 100 is divisible by 1, 2, 4, 5, 10, 20, 25, 50, and 100, therefore the only number divisible by 87 and 100 is 1.
72 is a composite number. A prime number is a number that is divisible only by 1 and itself; it has no other factors. A composite number is a number that is divisible by more than two numbers - more than 1 and itself. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. Therefore, it is a composite number.
To find a number less than 100 that is divisible by 2, 5, and 9, we need to find the least common multiple (LCM) of these three numbers. The LCM of 2, 5, and 9 is 90. Therefore, the number less than 100 that is divisible by 2, 5, and 9 is 90.
It is: 7200/100 = 72