First, convert the decimals into improper fractions. The fractions are: 31/10 and 10261/1000. To divide the fractions, change division into multiplication after flipping the numerator and the denominator of the second fraction. This comes out to be 31/10 *(times) 1000/10261. 31*1000 is 31,000 and 10*10261 is 102,610. This equals the fraction: 31,000/102,610. Simplify this.
Since videos are 3 dollars since 1 times 3 is 3, 3 times 15 would be 45 dollars worth of videos. So you could purchase 45 songs after buying 15 videos.
