Question

Deloise has $$1.20$ in pennies and nickels in a jar on her desk. The number of pennies is three times the number of nickels. How many coins of each type does she have?

Short answer

The number of nickels is $15$ and pennies are $45$ .

Step-by-step solution

Step 1. Given Information

Total amount$=\$1.20$

Let he number of nickels be $x$

Therefore ,

According to the question,

number of pennies will be$3x$

Step 2. Solution of the equation 

Now, According to the question,

$0.05x+0.01\left(3x\right)=1.20$

$$\begin{gathered} 0.05x+0.03x=1.20 \\ 0.08x=1.20 \\ x=15 \\ Therefore, \\ 3x=3\times 15=45 \end{gathered}$$