3 years ago

In a box of 36 36 pencils, 20 20 are sharpened. What is the ratio of sharpened pencils to unsharpened pencils?

Mathematics

1 answer:

Ganezh [65]3 years ago

7 0

Ratio would look like 20:36... Did you mean to put the numbers twice?

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Step-by-step explanation:

We can use the decay equation.

$M_{f}=M_{i}e^{-\lambda t}$

Where:

M(f) and M(i) are the final and initial mass respectively
λ is the decay constant (ln(2)/t(1/2))
t(1/2) is the half-life of Co
t is the time at the final amount of m

$M_{f}=228e^{-\frac{ln(2)}{7} 1.5}$

$M_{f}=197\: g$

<u>Therefore, we have 197 g of Co-60 after 18 months.</u>

I hope it helps you!

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