exam Maths Puzzle Numerical Ability

The maximum speed of a greyhound is 153 miles per hour less than 3 times the maximum speed of a cheetah. If a greyhound's maximum speed is 42 miles per hour, what is the maximum s

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exam Other Question
When I get to Factoring 40 I can not get anything to add to get 22. How would I work the problem out? Find the inverse of the matrix:

[ 1 -2
5 4 ]


(a) [ -2/3 -1/3
5/6 -1/6 ]

(b) [ 2/7 1/7
-5/14 1/14 ]

(c) [ -1/14