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# Linear Diophantine Equations

What amounts of money can you make with only $5 and $7 bills? Can you make $23 with those 2 types of bills?

\[ \large{\begin{array}{ccccccc} && & & & A &B&C\\ && & & & & A&B\\ +&& & & & & &A\\ \hline && & & & 8 & 7&6 \end{array}} \]

Find the value of the 3-digit integer \(\overline{ABC}\).

\[ \large{\begin{array}{ccccccc} && & & & &&X\\ && & & & & Y&X\\ +&& & & & Z &Y &X\\ \hline && & & & 4 & 3&2 \end{array}} \]

Let \(X,Y\) and \(Z\) be distinct digits that satisfy the cryptogram above.

Find the value of the 3-digit integer \(\overline{ZYX} \).

\[ \large{\begin{array}{ccccccc} && & & & & 3& L \\ \times && & & & &M &M\\ \hline & & & & 2&N & 6&4 \end{array}} \]

Find the value of \(L \).

Hint: Using the divisibility rule for 11.

\[ \large{\begin{array}{ccccccc} && & &T & U& V&W\\ \times&& & & & &9&9\\ \hline & & T & U & U& 5& 5&1 \end{array}} \]

Find the value of \(T.\)

Hint: 99 = 100 - 1.

\[ \begin{array}{ccccc} & & & & &X\\ & & & &X &Y\\ + & & & Z & Y &Z \\ \hline & & & Y & X &Z \end{array} \]

Solve the cryptogram above, where \(X,Y,Z \ne 0 \), and find the value of the 3-digit integer \(\overline{YXZ}\).

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