Question

Li needs 15 pieces of string each 1/2 of a inch long.She cut a 6-inch piece of string into pieces that are each 1/2 of an inch long. How many more pieces of string does she need

Answer 1

Li need 3 more pieces of string

Solution:

Given, Li needs 15 pieces of string each $\frac{1}{2}$ of a inch long.

She cut a 6-inch piece of string into pieces that are each $\frac{1}{2}$ of an inch long.  

Now, let us find how many pieces she got from 6 inch string.

$\text { Number of pieces }=\frac{\text { length of string available }}{\text { length of each string }}$

$=\frac{6}{\frac{1}{2}}=6 \times \frac{2}{1}=6 \times 2=12$

Then, she will get 12 pieces from 6 inch string.

Number of pieces she need more = total number of pieces she need – available pieces  

= 15 – 12 = 3

Hence, she need 3 more pieces.