exam Maths Puzzle Numerical Ability

margaret is twice as old as jenny, and sarah is twice as old as margaret. Their combined ages total 133 years. How old is each person? in equation form

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exam Other Question

Find the inverse of:
[a b
_c d]

So far I have done this:

__[ a b 1 0
____c d 0 1]

~_[ 1 b/a 1/a 0
____c__d___0__1 ]

~_[ 1____b/a_____1/a____0
____0__d-(cb/a)__-c/a A hospital parking lot charge $2.00 for the first hour or part thereof, and $1.00 for each additional hour or part thereof. A weekly pass costs $34.00 and allow unlimited parking f