book Maths Puzzle Numerical Ability

1. 5x+9=2

2. 7-6d=3

3. 13y-2=4

4. 16=5-18n

5. 23a=1=11

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book Other Question

find the product of 3m squared over 2m times 18 m squared over 9m. and assume that no denominator is the value of zero. an airplane took 2 hours to fly 600 km against a head wind. the return trip with the wind took 1 2/3 hours. find the speed of the plane in still air.