exam Maths Puzzle Numerical Ability

For the input-output matrix A, find the output required to meet the demand D.

A=[0.2|0.4]
[0.3|0.6]

D= [700]
[400]

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exam Other Question

Find three consectutive integers such that 4 times the largest exceeds three times the second by 10. The speed of computers is measured in number of calculations per picosecond.There are 3.6x10 to the 15th power picoseconds per hour.What fraction of a second is a picosecond?