Question

Jeff spent 1/2 on his Saturday earnings on a pair of shoes and 1/2 of the remaining money on a CD. After he spent $5.35 on lunch, he had $10.85 left.
How much did he earn Saturday?
A.$32.25
B.$36.45
C.$60.40
D.$64.80
Please explain.

Answer 1

reverse all the operations..change subtraction to addition..division to multiplication

((10.85 + 5.35)2)2 =?

i'll leave that to you :P

Answer 2

Thanks, wait please, I will type my answer shortly.

Answer 3

okay

Answer 4

Thanks

Answer 5

Order of operations, PEMDAS?
(Parentheses
Exponents
Multiplying
Dividing
Adding
Subtracting)?

Answer 6

Do I use this?

Answer 7

right now yes :D

Answer 8

ok. Wait 1 sec.

Answer 9

$48.75

Answer 10

hmm seems wrong...try again :) and also that wasnt in the choices haha

Answer 11

(embarrased) lol

Answer 12

Please click on the image,it show the online calculator i was using.

Answer 13

4 x 10.85 + 5.35 is not equal to what i wrote...according to this you'll multiply 4 by 10.85 first...but you need to add first THEN multiply..remember i had a parenthesis

Answer 14

Were did you get the 4 from?

Answer 15

Btw, I am making a Google Docsl with the problems on my worksheet, is it ok if i give you the online link to it after I finish it?

Answer 16

lgbaallote?

Answer 17

basallote (sorry,mispelled your username)

Answer 18

One way is to use algebra. The other way is to use logic !

First the logical way. Since Jeffrey has spent one half of the amount on a pair of shoes , and one half of the remaining amount on a CD , it means he has spent 3/4 of his earnings. He is therefore left with just a quarter of his earnings. After spending $ 5.35 from this on lunch , he has $ 10.85 left.

This means that one quarter of his earnings are $ 10.85 + $ 5.35 = $ 16.20

Thus his total earnings are $ 16.20 * 4 = $ 64.80

In case you use algebra , assume that his earnings are 'x'.

His total expenditure is x/2 + 1/2(x - x/2) + 5.35

What he has left with him will be his earnings less his expenditure i.e. x - (x/2 + 1/2(x - x/2) + 5.35). According to the problem , this is 10.85

Equating the two :

x - x/2 -x/2 + x/4 - 5.35 = 10.85

i.e. x/4 = 10.85 + 5.35 = 16.20 which gives x = 4 * 16.20 = 64.80.

Answer 19

sorry i went out...^that's the answer

Answer 20

kumar, I have not learned how to work out those types of equations; could you simplify or shorten your explanation please?

Answer 21

add 10.85 and 5.35 first...it will become 16.20. multiplied by 2 = 32.4..multiply by 2 again...64.8

Answer 22

((10.85 = 5.35)2)2 = ((16.20)2)2 = (32.40)2 = 64.80

Answer 23

^that's + in the parenthesis

Answer 24

Ok. I get it now, thanks, lg! so ccan I send you the link? it's only a document with my worksheet's problems typed on it.

Answer 25

okay

Answer 26

tnx.

Answer 27

im typing as fast as i can.