exam Maths Puzzle Numerical Ability

quadratic formula
2xsquared + 5x + 11=0

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exam Other Question

30x+50y-100=0
3x-15y-30=0 Will you please help me with this word problem. The units digit of a two-digits number is 1 more than 4 times the tens digit. If the digits are reversed, the new number is 5 more than 3 times the original number. Find the original number.