exam Maths Puzzle Numerical Ability

Find two consecutive integers such that the sum of 3 times the first integer and 7 times second integer is 47.

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Hi guys, hope you can help me with this problem

At a grocery store, the bananas they receive are transported throug 3 stages; from the farmer to the market, from the market to t solve for the three variables

r+s-2t=4
r-3s-4t=-2
2r+s+2t=0