Answer:
16.2
Step-by-step explanation:
By geometric mean theorem:

He worked as a carpenter for 12 hrs. and as a blacksmith for 18.
There are 145 total pieces . you must first convert 20% to a decimal by placing a decimal point two places from the right. 20% = .20
then you mulitiply 145 x .20 = 29
So, Cathy owns 29 pieces of yellow clothing.
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