Explanation:
Going L to right
10 x 5 1/4 = 52.5
then 52.5 *3 1/5 = 168 via calculator
OR
10 * 21/4 = 210 / 4
210/ 4 * 16/5 = (210 * 16) / ( 4*5) = 3360/20 = 168
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