exam Maths Puzzle Numerical Ability

find x
m<4=-x+25 m<7=5x+23

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solve these word problems :

1)A temperature of 41 degrees F is equivalent to 278.2 degrees K, while a temperature of 86 degrees F is equivalent to 303.2 degrees K. Find the Your computer supply store sells two typers of laser printers. The first, Type A, costs $160 and you make a $40 profit on each one, The second, type B, costs $120 and you make a $3