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Please help with this problem sum , photo attached Thank you.

Please help with this problem sum , photo attached Thank you.-example-1
User Cco
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Let G, B and Y denotes the number of green, blue and yellow marbles.

Given that:


\begin{gathered} G+B+Y=694 \\ B=3Y \\ B=G+90 \end{gathered}

From this,


Y=(B)/(3),G=B-90

Substitute the vlaues of Y and G into the equation G+B+Y=694.


\begin{gathered} B-90+B+(B)/(3)=694 \\ (7B)/(3)-90=694 \\ (7B)/(3)=784 \\ B=(784\cdot3)/(7) \\ =336 \end{gathered}

Keith had 336 blue marbles.

User Beanwah
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