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pls solve this question

Refer the following link for the answer similar to your query :

https://www.meritnation.com/ask-answer/question/two-schools-a-and-b-want-to-award-their-selected-teachers-on/matrices/8739875

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3x+2y+z= 2200 and 4x+y+3z=3100 and x+y+z=1200
now we have the 3 equations , thus we can easily solve this ques using matrices 
ie AX=B 
=> X=A-1B
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hope this will help you
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