Your tax will be $1.87 and your total cost will be $31.86
Let the amount of stamps Mari has be “m”. Since Carlos has 5 more stamps than Mari, Carlos will have 5+m stamps. Amanda has three times as many stamps as Carlos so that will be 3(5+m)=15+3m.
m+(5+m)+(15+3m)=100
5m+20=100
5m=80
m=16
Mari=16
Carlos=16+5=21
Amanda=15+48=63
For 7., you have to add 3 to both sides to cancel out like terms, so you'll end up with:
x/8=10
Then cross multiply, you'll get x=80.
For 9., add 2n to both sides and subtract 2 from both sides to get 39=3n. Divide both sides by 3 to get n= 13. Hope this helps!
Answer:
12 divided by 2/3 is 8
A situation this can be used in is if you are dividing 12 pieces of candy between you and your two friends. Two-thirds of the candy will go to your friends.
