exam Maths Puzzle Numerical Ability

Linda can stuff 1000 envelopes in 6 hours. If Laura helps her, they can both stuff 1000 envelopes in 5 ½ hours. How long would it take Laura to stuff 1000 envelopes by herself?

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exam Other Question
3a-9=3(9-3a) I need a little help with the following problems:

2x + 3y = 8
2x - y = -8


3x - 2y = -5
3y - 4x = 8


3x - y = 12
y - 3x = 15