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D
Just need to get an equation.

A = \(\frac{(B+C)}{3}\) = \(\frac{(total - A)}{3}\)
B = \(\frac{2(A+C)}{7}\) = \(\frac{2(total - B)}{7}\)

A - B = 12.4
\(\frac{(total - A)}{3}\) - \(\frac{2(total - B)}{7}\) = 12.4
\(\frac{(7Total - 7A - 6Total + 6B)}{21}\) = 12.4
(Total - 7A + 6B)= 21*12.4
A + B + C - 7A + 6B = 21*12.4
B + C - 6A + 6B = 21*12.4
B + C - 6(A-B) = 21*12.4
B + C = 21*12.4 + 6*12.4
B + C = 27*12.4 => A = 9*12.4
A + B + C = 36*12.4 = 446.4
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stoy4o
A certain sum of money is divided among A, B and C such that A gets one-third of what B and C together get and B gets two-seventh of what A and C together get. If the amount received by A is $12.4 more than that received by B, find the total amount shared by A, B and C.

A. $345.20
B. $386.40
C. $520.30
D. $446.40
E. None


Hi,

Since the method with equation is given, I will touch on an alternate method.

A bit of quick thinking at times can save you a lot of time
B gets \(\frac{2}{7}\) of (B+C), so total= A+B+C=\(\frac{2}{7}\)*(B+C)+B+C=\(\frac{9}{7}\)*(B+C)..
Here B+C=TOTAL*\(\frac{7}{9}\)..
So answer should be div by 9, only D is left.

If there are two three choices fitting in, one more calculation can get you to answer.
Best if you are clueless on making equations and the choices does not have None in choices
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D
The problem is not hard at all, if you get the logic of it
If A has \(\frac{1}{3}\) of B and C, this means that B and C together have \(\frac{3}{3}\) . So A has 1 peace, B and C have 3 peaces, overall A has \(\frac{1}{4}\) of the total share. If we apply similar logic to B, B has\(\frac{2}{9}\). Now we can make an equality.

\(\frac{1}{4}\)x - \(\frac{1}{9}\)x = 12.4

\(\frac{(9-8)}{36}\)x = 12.4

\(\frac{1}{36}\)x = 12.4

x= 12.4*36=446.4

Hope that helped

Just a small correction...

1/4x-2/9x=12.4
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Solution



Given:

    • A certain sum of money is divided among A, B and C.
    • A gets one-third of what B and C together get.
    • B gets two-seventh of what A and C together get.
    • Amount received by A is $12.4 more than that received by B

To find:
    • Find the total amount shared by A, B and C.

Approach and Working

A gets one-third of what B and C together get.
    • Thus, if A gets ‘a’ then B+C= 3a
      o A+B+C = 4a

B gets two-seventh of what A and C together get.
    • Thus, B gets 2b, then A+C = 7b
      o A+B+C = 9b

Now, A+B+C is equal to 4a as well as 9b.
    • Therefore, we can assume A+B+C= 36k.
      o Hence, A= 9k, B= 8k, c= 19k
    • 9k= 8k+12.4
      o k= 12.4
    • Therefore, total amount shared by A, B, and C= 9k=446.4

Correct answer: Option D
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