exam Maths Puzzle Numerical Ability

a fast food stand sells muffins and cookies. last monday the ratio of the number of muffins to the number of cookies sold was 16 to 13. a total of 145 muffins and cookies were sold. How many cookies were sold?

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i have another solve for the unknown

8/52 = m/39

again i know this is basic math but i am lost any help please thank you
A self-employed person deposits $3,000 annually in a retirement account (called a Keogh account) that earns 8 percent interest. How much will be in the account when the individul