exam Maths Puzzle Numerical Ability

solve for the three variables

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

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exam Other Question

Find two consecutive integers such that the sum of 3 times the first integer and 7 times second integer is 47. how old is pepe if 9 years he will be 4 years as old as he is now.