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Getting from point a to point b:
Hattie purchases 3 books for $3.75 each 5 notepads for $1.75 each. She uses the following equation to figure the total (before tax):
(3 x $3.75) + (5 x $1.75)
Which of the following is another that could also be used?
a. (3 x 5) + ($ 3.75 x $1.75)
b. (3 + 5) + ($3.75 x $1.75)
c. (8 x $3.75)  $10
d. 15 + ($3.75 x $1.75)
e. $3.75 + $1.75
I know that the correct answer is c just by doing the calculation, what I want to know is how is this equation derived from the data given; what principle(s) are used to come up with (8 x $3.75)  $10?
 one year ago
 one year ago
Getting from point a to point b: Hattie purchases 3 books for $3.75 each 5 notepads for $1.75 each. She uses the following equation to figure the total (before tax): (3 x $3.75) + (5 x $1.75) Which of the following is another that could also be used? a. (3 x 5) + ($ 3.75 x $1.75) b. (3 + 5) + ($3.75 x $1.75) c. (8 x $3.75)  $10 d. 15 + ($3.75 x $1.75) e. $3.75 + $1.75 I know that the correct answer is c just by doing the calculation, what I want to know is how is this equation derived from the data given; what principle(s) are used to come up with (8 x $3.75)  $10?
 one year ago
 one year ago

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HeroBest ResponseYou've already chosen the best response.0
Looks like you already have help
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
note that $3.75 is exactly $2 more than $1.75 so, for every one of the 5 x $1.75, you can move $3.75 into the $3.75 count as longas you reduce the 5 x cost by $2
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
I hope that made sense?
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
(3 x $3.75) + (5 x $1.75) = (3 x $3.75) + (5 x ($3.75  $2.00))
 one year ago

saifoo.khanBest ResponseYou've already chosen the best response.0
http://i1.kymcdn.com/entries/icons/original/000/009/993/tumblr_m0wb2xz9Yh1r08e3p.jpg
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
@jagatuba  did I explain it clearly enough for you?
 one year ago

jagatubaBest ResponseYou've already chosen the best response.0
No I'm sorry. I still cannot see how we are getting from (3 x $3.75) + (5 x $1.75) to (8 x $3.75)  $10 nor what if any mathematical principles are involved.
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
ok, do you agree with this step? (3 x $3.75) + (5 x $1.75) = (3 x $3.75) + (5 x ($3.75  $2.00))
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
I don't believe there is any deep mathematical principal being used here  just rearrangement of monetary amounts to make the calculation easier.
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
you basically need to have noticed that $3.75 is exactly $2 more than $1.75 and that 5 x $2 is a nice easy calculation
 one year ago

asnaseerBest ResponseYou've already chosen the best response.2
you will usually find street merchants are very good at these types of calculations. :)
 one year ago

jagatubaBest ResponseYou've already chosen the best response.0
I see thank you for the explanation @asnaseer. Sorry it took so long for me to respond back. I was just getting off work and then went Christmas shopping.
 one year ago
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