danne9000

The quick equation for this is as follows:

x=850/(2*6*24)

x=850/288

x=2.95, rounded up to x=3

Basically you calculate how many golf balls are in a case (24*6) and then multiply this by the price per golf ball which gives you the price per case.
Since you know they need to raise 850 you simply divide it by the value per case, the reverse of price*quantity=revenue and you have the number of cases.

Hope it helps,
Cheers

If you subract the persons weight by the maximum capacity of the elevator you have the total weight which can be "filled" by books. If you then divide this number by the weight of a box of books you'll have the number of boxes of books he could bring.

let x be number of books.

x=(920-170)/40

x=750/40

x= 18.75 boxes.

Techincally that means he'll probably only bring 18 boxes or 18 boxes and one which is 3/4 filled with books.

Cheers.

If you divide the total sales from umbrellas by the revenue per umbrella you'll find the number of umbrellas.
To get the total sale from umbrellas simply subtract chair rentals (130) from the total revenue (567). Then divide the answer by the cost per umbrella (19).

Let x be number of umbrellas.

Since x*19=567-130 -> Number of umbrellas * cost = revenue 
It follows that x=(567-130)/19

Hope it helps. Cheers.

If they cut 48 sections then that means that the original number of sections is times 0.4 (40%)
This can be expressed as x*0.4=48

Solving for x, simply rearrange to x=48/0.4
48*04=120 => x=120

You can double check this by 120*0.4 which is 48.

Since the question only pertains to those who actually participated in the survery, you can add upp the two groups and then divide the number of people who choose zoo by the total number of participants. Multiply the answer by one hundred to get the percentage rather than fraction (this isn't necesarrily required just easier to read out for most)

X=100*(28/(28+33))
X= 45.9%

If the question was how many people chose zoo out of all the people, even those who didn't participate you simply do 100*(28/70)=40%

Cheers!


Edit: Paranthesis

4.5*a=16.2

is the same as

a=16.2/4.5

a=3.6 

Just ask if you need further elaboration.  :)

Cheers

It's 35% of 21 000 seats which is calculated as 0.35*21 000= 7 350 fewer tickets sold. 

 

Here you want to find the total number of slices purchased, you can do this by 2*3=6.

Since we know they spent 0.75 each on a drink the total amount spent  on drinks was then 3*0.75=$2.25

Simply deduct the total spent on drinks from the total for the order and then divide by number of purchased slices.

11.25=0.75*3+6*x

Remove drinks from total

10=6*x

thus

x=10/6

x=$1.66

If we let X be the total problems you can solve for X.  (20%=0.2)
 

0.2*X=8

X=8/0.2

X=40

Find total

230+215+195+190= 830 students.

Next you divide the numbers from each grade with the total for the school to find the proportions for each grade.

I.e. 
Grade 9 = 230/830=0.277

Grade 10=215/830=0.259 

Grade 11=195/830= 0.235 

Grade 12=190/830=0.229

The just multiply each result with the number you're surveying (70*0.277= 19.39 to survey from grade 9). 

Then you end up with;

19 from grade 9

18 from grade 10

17 from grade 11

16 from grade 12