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You found the wrong difference I think, but I really like your method for solving this.

It is so simple.

KKD can finish it himself, he is capable.  

Answered by Jugoslav.

Thanks Jugoslav:)

x = total distance

x      -      4/5x       -     1/5 (1/5x)   = 12

x = 75 miles

What does this mean?  " I still had 12 miles to travel" ??!!

Fint the slope between two data points to b   m = 3

then y = 3n+ b     sub in one of the data points to calculate 'b' =7

then     output = 3n+7

x = 11 as a minumum.

3/6  x  3/6 ==9 / 36 ==1 / 4 - probability

B + s  = 8.96     and

B+ 1/5s  = 2.88         <===== multiply this equation by -5  and add to top equation ( this is to eliminate the 's')          

-4B = -5.44

B = 1.36 kg     

Let the number of $5 notes ==F

Let the number of $10 notes ==T

5F/(10T) == 3/2.................    .......(1)

1/5T + G ==Cost of the Gift.

G / (1/5T) ==3/1.........................(2)

5F - 5G ==360...............................(3), solve for F, T, G

F==90 - $5 bills,   T==30 - $10 bills,    G==18 - $5 bills spent on Gift.

(1/5 x (30 x 10) + (18 x 5) ==$60 + $90==$150 - Cost of the Gift.

before,
A: x+42
B: x

after,
A: x-76
B: x+118

3 x (x-76) = x+118
x = 173

in the end, Adam has 173-76 = 97 toy cars

Ken, Leo, and Mandy donated some money. Ken donated 1/4 of the total amount Leo and Mandy donated. Mandy donated 4/11 of the total amount of money that Ken and Leo donated. Leo donated $37.50 more than Ken. Express the amount of money Leo donated as a decimal if he had $100 initially.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Ken donated ====>  x

Leo donated ====>  37.50 + x

Mandy donated ==>  4/11(37.50 + 2x)

Leo + Mandy = 37.5 + x + 4/11(37.5 + 2x)

37.5 + x + 4/11(37.5 + 2x) = 4x          ("4x" is 4 X Ken's donation)

x = 22.5

So, Leo donated $60 out of $100, and that is 0.6 

(1 +2+3.....+12 ) / 12   = 78/12 =  6.5

Total cost will be        fixed fee  +     hourly fee* hours

41                     =            6        +          5     * h

41 = 6 + 5h    subtract 6 from both sides

35 = 5h          divide both sides by  h

h = 7  hours

Like  5/4  ?

.66666666 ... = 2/3

.0606060606..... = 2/33

2/3 * 2/33 = 4/99

4/99 = .0404040404040404...                          7 x 4 = 28 .

Let x = 0. 515515515......                        (    515/999   from the web2.0 calculator)

1000x = 515.515515......

-x               -.515515515.....

  999x = 515.0  

then x = 515/999

this is close:

y = 1.0896 (1.5^x) + 1003.725  

3/8

8 - 3 =5

1 - 4/7= 3/7

shirt = 4/7

left = 3/7 * 5x

      = 15x/7

15x/7 = $45

15x = $45 * 7

       = 315 ÷ 15

       = 21

orignal money = 8x

                        = 8 * 21

                        = $168

See answer under your original post.

B==Bookmarks,     S==Stickers.

Jason ==1/2B  +  1/2S

Kelvin==1/2S  +  1/2B

Jason ==[1/2B  +  1/2S] - 7

                 [1/2B - 7] / [1/2S] ==1 / 9...................(1)

Kelvin==[1/2B] /[1/2S - 12] ==1/6....................(2), solve for B, S

B==50,     S==324

(a) Kelvin had in the end==[1/2*324 - 12[==162 - 12 ==150 stickers.

(b)Jason bought ==50 Bookmarks.

1/5   + 1/25  + 1/125

25/125  +  5/125  + 1/125

31/125

31 ÷ 125

= .248

1/9x+ 5/8(8/9)x + 81=x

108 shirts

 2^2999*5^3002==1.25 x 10^3001==sum==1 + 2 + 5==8 - there are 3001 zeros after 1.25

(0.0123, 0.10203, 0.112233, 0.1223, 0.123, 0.123, 0.13)

0.10203 + 0.123 ==0.22503

Just one 2-digit number:

54 ==6 x [5 +4] ==6 x 9 ==54