Answer:
$36 is the correct answer.
Step-by-step explanation:
Given that:
Adam has $15 of a certain type of rare coin.
$5 of this type of rare coins are equivalent to $12.
To find:
The total worth of $15 of rare coins = ?
If value of each coin is same.
Solution:
We are given that value of each coin is same.
So, We can simply use unitary method to find out the total worth of $15 of rare coins.
i.e. we first find out what is the worth of $1 of rare coins and then we find the worth of total required quantity.
Given that
$5 of rare coins are worthy of = $12
$1 of rare coins are worthy of = [tex]\frac{12}{5}[/tex]
$15 of rare coins are worthy of =
[tex]\\\dfrac{12}{5}\times 15\\\Rightarrow \dfrac{12\times 15}{5}\\\Rightarrow 12\times 3\\\Rightarrow \$36[/tex]
[tex]\therefore[/tex] $15 of rare coins are worth of $36.
