Question

145 yards increase to 165 yards. What is the percentage increase?

Answer 1

165 - 145 = ??

Answer 2

20

Answer 3

now divide that difference by the original amount

Answer 4

20/145 = ??

Answer 5

7.25

Answer 6

divide the other way around

Answer 7

the answer is NOT 7.25 %

Answer 8

oh the other answer is 0.138

Answer 9

13.79%?

Answer 10

looks like they had a trap set up

Answer 11

20/145 = 0.1379 = 13.79%

Answer 12

Yup

Answer 13

how does 0.1379 equal 13.79

Answer 14

sorry

you multiply 0.1379 by 100 to convert it to a percentage

Answer 15

that's why 0.1379 = 13.79%

Answer 16

oh ok thanks

Answer 17

np

Answer 18

can you help me with some other math probs

Answer 19

sure just a few though

Answer 20

ok do you want me to put it in a new question box so you can get the medal

Answer 21

either way works

Answer 22

bike travels 12.5 miles in 2 hours and 30 minutes and 27.5 miles in 5 hours and 30 minutes. What is the constant of proportionality?

Answer 23

2 hours, 30 minutes = 2.5 hours

Answer 24

so you just divide 12.5 miles by 2.5 hours

this will give you the speed, which is your answer

Answer 25

5

Answer 26

yep

Answer 27

ok Ruth wants to buy a sweater. The sweater costs $39.50, and the sales tax in her state is 4%. In which of the following equations does x represent the amount of tax Ruth will pay?

Answer 28

show me the equations and what you think

Answer 29

ok wait a min

Answer 30

k

Answer 31

hints:

part/whole = percent/100

and

4% = 4/100 = 1/25

Answer 32

is it a

Answer 33

what is x

Answer 34

not the number but what does it represent

Answer 35

the amount of tax Ruth will pay

Answer 36

is that the "part" or the "whole"

Answer 37

whole

Answer 38

or is it part

Answer 39

which one?

Answer 40

think about it: the tax is a small piece of the picture (compared to the value of the item being bought)

Answer 41

i dont know i hate percent problems

Answer 42

the tax is the "part", the cost of the sweater is the "whole"

Answer 43

so its the part

Answer 44

the bigger number is always the "whole"

Answer 45

its b the answer is b

Answer 46

so

part/whole = percent/100

part/whole = 4/100 ... because it's a 4% tax

x/whole = 4/100

x/39.50 = 4/100

x/39.50 = 1/25

Answer 47

yep

Answer 48

ok one more question

Answer 49

The price of a large pizza in 2009 was $15, it was raised to $21 by 2011. By what percentage did the price of a large pizza increase?

Answer 50

ok

Answer 51

what's the change in price

Answer 52

6

Answer 53

divide that by the original price

Answer 54

you should get a number between 0 and 1

Answer 55

0.4 then i multiply by hundred and that's my answer which is 40

Answer 56

yep 40%

Answer 57

thank you very much you are a great teacher

Answer 58

glad to be of help