a.) We want to find out the unit rate (pages per 1 minute), therefore, we must do and get [tex]48 \text{ pages} \div 6 \text{ minutes} = {8 \text{ pages per minute}} [/tex].
b.) We can write a proportion and just solve for how many pages the fax machine can transmit knowing the unit rate of 8 pages per minute. (I prefer the latter option.) So we just multiply: [tex]\text{8 pages per minute } \times \text{ 10 minutes} = \text{80 pages} [/tex]
