Question

If the cost of 3 notebooks is 30.30, then find the cost of 15 such notebooks. ​

Answer 1

Answer:

If the cost of 3 notebooks is 30.30, we can infer the cost of one notebook is 10.10.

Step-by-step explanation:

$10.10 * 15 = x$

$10.10 * 15 = 151.5$

Answer 2

Hi student, let me help you out! :)

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We are asked to find the cost of 15 notebooks, given that the cost of 3 notebooks is 30.30.

$\triangle~\fbox{\bf{KEY:}}$

• First of all, we need to find the cost of 1 notebook.

So we divide the cost of three notebooks (30.30) by 3:

$\star~\large\pmb{30.30\div3}$

$\star~\large\pmb{10.10}$

That's the cost of 1 notebook. Now, multiply that times 15 (we're asked to find the cost of 15 notebooks).

$\star~\large\pmb{10.10\times15}$

This gives us:

$\star~\large\pmb{151.5}$

That's the cost of 15 notebooks if the cost of one notebook is 10.10.

Hope it helps you out! :D

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