Answer:
1) 5.6 cents
2) 30 cds
Step-by-step explanation:
For both problems we can use the Rule of Three:
1) If 3 ounces of tomato sauce cost [tex]\$1.68[/tex], how many will cost 1 ounce?:
3 oz ---[tex]\$1.68[/tex]
1 oz --- ?
Then:
[tex]?=\frac{(1 oz)(\$1.68)}{3 oz}[/tex]
[tex]?=\$ 0.056[/tex]
This is the price in dollars, now we have to calculate it in cents, taking into account that [tex]100 cent=\$1[/tex]:
[tex]$ 0.056 \frac{100 cent}{\$1}=5.6 cents[/tex] This is the price in cents of 1 ounce of tomato sauce
2) If Edward buys 60 cds for [tex]\$ 7[/tex] each, what is the cost of 60 cds?:
60 cds ---?
1 cd --- [tex]\$7[/tex]
[tex]?=\frac{(60 cds)(\$7)}{1 cd}[/tex]
[tex]?=\$ 420[/tex] This is what Edward spends in 60 cds for [tex]\$7[/tex] each
Now, we have to calculate how many cds Edward can buy for [tex]\$14[/tex] each and spend the same [tex]\$ 420[/tex]:
1 cd --- [tex]\$14[/tex]
? cds ---[tex]\$ 420[/tex]
[tex]?=frac{(\$ 420)(1 cd)}{\$14}[/tex]
Finally:
[tex]?=30 cds[/tex]
