exam Maths Puzzle Numerical Ability

if x varies directly as y, and x=42 when y = 6, find x when y = 7

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exam Other Question

5 over 2
-
5 over X2-4

=
1 over x+2
An amount of money is invested at 4% annual simple interest, and twice that amount is invested at 5%. The total annual interest is $112. How much is invested at each rate?