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I'm currently on khan academy and am stuck at solving the following question. I try to use the 'multiply fraction by whole number' solution, however the correct solution is different. What is the correct way to solving this?

3/7 r + 5/8 s when r = 14 and s = 8

The way i solve it leads me to: 3/98 + 5/8

(using this process 3/7 * 14/1 = 3/7 * 1/14 = 3/98 )

However the correct solution is: 3/7(14) + 5/8(8)