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Mathematics 69 Online
PuzzledGurl:

Mindy's dog, Rex, weighed 80 pounds a year ago. Now he weighs 92 pounds. What is the percent increase in his weight?

PuzzledGurl:

The options are A. 13% B. 16% C. 12% D. 15%

dude:

Okay to find increase subtract the new number by the original 92-80=

PuzzledGurl:

which is 18 right

dude:

Not quite

PuzzledGurl:

Oh my Jesus i hate when i try to do things in meh head ... my head is crazy

PuzzledGurl:

OK it is 12

dude:

Yes

PuzzledGurl:

K

dude:

To find the percent change, set that number over the original \(\frac{12}{80}\)

PuzzledGurl:

next?

dude:

Divide them

PuzzledGurl:

so \[12/80\]

PuzzledGurl:

0.15?????

dude:

Yes

dude:

Now multiply it by 100

PuzzledGurl:

so is hat yhe answer

PuzzledGurl:

that the*

PuzzledGurl:

15% i mean

dude:

Yes

PuzzledGurl:

Okay

PuzzledGurl:

Leo weighs 10 pounds of dog food at the pet store. The scale mistakenly lists the bag at 11.5 pounds. what percent difference Candice buys a board that is 12 feet long. The store incorrectly measures and prices the board at 13.2 feet. what percent difference Lenny's bug collection has a bug that is 16 centimeters long. Lenny fumbles with a ruler and incorrectly reports the bug to be 18 centimeters long. Josie's GPS shows that she traveled 20 miles in her car. Her car's odometer is slightly off and measures the distance as 24 miles.

dude:

Okay then the general idea for these is to do the highest number minus the lowest Then set what you got from that by the first (original/small) number and multiply by 100

PuzzledGurl:

11.5-10=1.5 1.5*100=150 that is the first one 13.2-12=1.2 1.2*100=120 18-16=2 2*100=200? 24-20=4 4*100=200?

PuzzledGurl:

Oh no I did it wrong didnt i

dude:

Yeah you were supposed to set the difference over the original number So for the first one it would be 1.5/10 and then multiplied by 100

PuzzledGurl:

1.5/10=0.15

dude:

Right and then multiply by 100

PuzzledGurl:

0.15*100?=15

PuzzledGurl:

so 15%?

dude:

Yes it is 15%

PuzzledGurl:

okay

PuzzledGurl:

so... next is...?

dude:

`13.2-12=1.2 1.2*100=120` you want to set 1.2 over the original amount

PuzzledGurl:

?so 1.2/12?

dude:

Yes

PuzzledGurl:

=0.1

PuzzledGurl:

so the answer is 10%?

dude:

Yep

PuzzledGurl:

next

PuzzledGurl:

pls*

dude:

18-16=2 2*100=200 2 over the original amount

PuzzledGurl:

2/16 or 18?

PuzzledGurl:

wait i hink i know the answer

PuzzledGurl:

think*

PuzzledGurl:

20%?

dude:

It is 2/16 which is 12.5 or 12.5% xD

PuzzledGurl:

oh

PuzzledGurl:

:P

PuzzledGurl:

thx i made 100%

dude:

Nice

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