To evaluate 21*(80*20), we can follow the given equation:
a * b = a * b / (a + b) + 5
Let's substitute a = 21 and b = (80 * 20):
21 * (80 * 20) = 21 * (80 * 20) / (21 + (80 * 20)) + 5
Now we can simplify the equation using the order of operations (parentheses first):
= 21 * (1600) / (21 + 1600) + 5
Next, we can perform the multiplications and addition inside the parentheses:
= 21 * 1600 / 1621 + 5
= 33,600 / 1621 + 5
Now, we can divide 33,600 by 1621:
≈ 20.6986 + 5
Lastly, we add 20.6986 and 5:
≈ 25.6986
Therefore, 21 * (80 * 20) is approximately 25.6986.
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