ElectricPavlov

= (4+10) / 2 =   14/2  = 7               When adding or subtracting fractions you MUST have a common denominator....in this case you already have a common denominator of '2'   so you just add the numerators over the common denominator...

All of them can appear .....just cube the numbers  0 - 9 to find: 

0^3 = 0 

1^3 = 1 

8^3 = 512 

7^^3 = 343

4^3 = 64

5^3 = 125

6^3 = 216 

3^3 = 27 

2^3 = 8 

9^3 = 729 

y = your money 

b = brother's money 

y-5 = b+5      Given 

2 ( b-25) = y + 25      Given 

From the first equation y = b + 10      sub this value of 'y' into the second equation to get 

      2 ( b-25) = (b+10) + 25 

        2b - 50 = b + 35 

          b = 85    dollars                             ( and y = 95) 

Having trouble pasting links..... this was answered a few days ago: 

x = worker days needed to complete the job

x/5  =  days for 5 to complete 

x/(5+1) = x/5 - 8     

x/6 = x/5 - 8 

5x/30 - 6x/30 = - 8

     solve for x = 240 worker days 

Now for 28 days less:

240/ ( 5 + n) =  240/5 -28      where n = number of additional workers

240/(5+n) = 20 

n = 7 additional workers needed above the original 5 

15 P 3  = 2730 ways       this is    15! / 12!       Or  15 for first choice * 14 for second * 13 for third = 2730 

       It would not be 15 C 3  because the order matters 

52 p 2 = 2652 ways    this is   52 ! / 50!       or    52 cards for first choice * 51 cards for second choice = 2652 ways 

https://web2.0calc.com/questions/help_95630

x = worker days needed to complete the job

x/5  =  days for 5 to complete 

x/(5+1) = x/5 - 8     

x/6 = x/5 - 8 

5x/30 - 6x/30 = - 8

     solve for x = 240 worker days 

Now for 28 days less:

240/ ( 5 + n) =  240/5 -28      where n = number of additional workers

240/(5+n) = 20 

n = 7 additional workers needed above the original 5 

A = pizza eaten by A

3/2 A = pizza eaten by B 

A + 3/2 A = 1   whole pizza

5/2 A = 1 

A = 2/5  of the pizza       so:    2/5 * $ 18 = $ 7.20 = A share       and       B  pays the rest = $ 10.80