The answer is 308.11. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
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63 is the only composite number in that list.
To simplify 280/315, we first look for common factors between the numerator (280) and the denominator (315). Both numbers are divisible by 5, so we can divide both by 5 to get 56/63. Next, we see that both 56 and 63 are divisible by 7, so dividing both by 7 gives us the simplified fraction of 8/9. Therefore, 280/315 simplified is 8/9.
6 + 3 + 21 + 63 + 21 = 114
The answer to this problem is 703.
12 + 15 + 63 + 12 + 24 + 34 + 23 + 15 = 198