book Maths Puzzle Numerical Ability

0.5w=0.35(the answers are..........7, 0.7, 0.007, or none of these)

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book Other Question

Solve by the substitution method
x+y=4
x-y=5 i am not quite sure if this is in the right cat. so i apologize ahead of time if it is not...
i have been havin alot of trouble with this problem....so any help would be appreciat