nooby math question D: (1 Viewer)

[cUfffsxd]

I'm studying for math sc and im doing 1999 non calc section; Question 19 asks

" A bottle of wine costs $10"
"The wine itself costs $6 more that the bottle"
"Whats is the value of the bottle?"

i get $4 xD but answer is $2 anyone care to explain please.

thx in advance

 

[wixxy2348]

Ok well....
Take the $10 which is the wine.
Minus $6.... you get the cost of the bottle + the cost of the wine (minus 6)
= 4.... Divide it by 2 and you get $2 value for the bottle.

Alternatively, working backwards, you can say "there's $2 (bottle).... if the wine costs $6 MORE than that, the value of the wine = $8.. + $2 = $10"

 

[x3.eddayyeeee]

basic algebra should explain.

Let bottle be represented by letter $(x)
Therefore the wine itself must cost $(x+6) as stated in the information.

That means

bottle + wine = $10
x + (x + 6) = $10
2x + 6 = 10
2x = 4
x = 2

Therefore the bottle (represented by x) is equal to $2.

 

[cUfffsxd]

Ahh i get it XD thx heaps;;

 

[cUfffsxd]

Ahh im stuck again ><"

1 cup per wash; box contains 24 washes; thersa uses 3/4 cups per wash; How many washes did she get out of the box?

 

[x3.eddayyeeee]

Find out how many "3/4 s" there are in 24.

In other words.
Divide 24 by 3/4.

Should be 32.

 

[cUfffsxd]

OKayy this is going to sound horrible butt;; how do i do that ?

i know that 24 / 0.75 = 2400 / 75 but how do i do that :<

damn calculator has ruined me XD

 

[occer]

S -> d

 

[samthebear]

OKayy this is going to sound horrible butt;; how do i do that ?

i know that 24 / 0.75 = 2400 / 75 but how do i do that :<

damn calculator has ruined me XD

if you want to do this manually (as in divide 24 by three-quaters) just take 24 and multiply it by the reciprocal of 3/4 so you just get:

24 X 4/3 = 96/3 = 32

but if you mean:
How do i make 24/0.75 = 2400/75 you just multiply 24/0.75 with 100. Shift the decimal place two times to the right on both the denominator and numerator and you'll get 2400/75.

But it gives you the same result anyways. i suggest you do the method i mentioned above - its easier than converting a fraction into a decimal then multiplying it by a 10/100/1000 to get it into a whole number THEN dividing the whole deal.

 

[cUfffsxd]

Its non- calculator section tho :S, I dont wanna get in trouble

Thx samthebear =D

 

[samthebear]

nps - i sucked at non-calc section in the SC anyways lol. i only got better after doing a whole year of ext 1 maths XDDD just gotta practice it =]

 

[cUfffsxd]

new problem xD

"The recommended daily intake of iron is 15milligrams. One serving of cereal contains 3milligrams of iron.

What percentage is this of the recommended daily intake?"

Yes no calculator..


so far ive done 3/15 = 100/15 = 6 10/15 ....but ive dug myself into a hole with the mixed numeral. So what can i do XDD??

 

[Absolutezero]

3/15 (then divide by three to get simpliest fraction)

= 1/5

1/5 * 100

=100/5

=20

Thus, 20% of Daily intake

 

[cUfffsxd]

omggg so simple. Why didnt i think of simplifying first ><"

thx heaps