Mathematics, 09.01.2020 00:31 jaylinperez9123
A, b,c, d each have some money. the amt a has is 1/3 total of b, c and d. the amt b has is 1/4 total of a, c,d. the amt c has is 1/5 total of a, b,d. if d has $1725, how much do they have altogether?
Answers: 3
eq. 1
eq. 2
eq. 3
![X=\left[\begin{array}{c}a&b&c\\\end{array}\right]](/tpl/images/0447/5645/4b671.png)
![A=\left[\begin{array}{ccc}3&-1&-1\\-1&4&-1\\-1&-1&5\end{array}\right]](/tpl/images/0447/5645/e3be2.png)
![B=\left[\begin{array}{c}1725&1725&1725\\\end{array}\right]](/tpl/images/0447/5645/75e48.png)
![\left[\begin{array}{c}a&b&c\\\end{array}\right]=\left[\begin{array}{ccc}3&-1&-1\\-1&4&-1\\-1&-1&5\end{array}\right]^{-1} \left[\begin{array}{c}1725&1725&1725\\\end{array}\right]](/tpl/images/0447/5645/a0259.png)
![X=\left[\begin{array}{c}1125&900&750\\\end{array}\right]](/tpl/images/0447/5645/d2dec.png)
(proved)
(proved)
(proved)
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A, b,c, d each have some money. the amt a has is 1/3 total of b, c and d. the amt b has is 1/4 total...
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