exam Maths Puzzle Numerical Ability

log(3)9
Evaluate:

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Kevin earned $165 interest for 1 year on an investment of $1500. At same rate, what amount of interst would be earned by investment of $2500? Here is what I came up with. Please help me. Thank you in advance.
$2500 x 12= $300 interest 1. In a certain cookie recipe, the ratio of flour to cups of sugar is 3 to 1. If the recipe uses 2 1/4 cups of flour, how much sugar does it use?