What is the quotient of 18 five sixths divided by 20 times of three fifths? (with formula)

What is the quotient of 18 five sixths divided by 20 times of three fifths? (with formula)

What is the quotient of 15 divided by three, divided by the product of six fifths and three fifths?

15/3/（6/5*3/5）=30/3=10
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What is the quotient of the sum of two fifths and two fifths, divided by the product of ten and one fifths
Remember division, not division!
To synthesize formula, synthesize!

（10×1/5）÷（2/5+2/5）
=2÷4/5
=2×5/4
=5/2
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A simple operation of one and two-thirds minus one-fifth plus three eighths and subtracting three eighths from four fifths

A simple operation of one and two-thirds minus one-fifth plus three eighths and subtracting three eighths from four fifths
1 (1 / 2) - 1 / 5 + 3 / 8 - (3 / 8) + 4 / 5
=(3/2)-1/5+4/5
=3/2+3/5
=(15+6)/10
=21/10
=2.1