need the 2 missing blanks

The miles walked on Tuesday and Wednesday given the total miles walked is 5 miles and 15 miles respectively.
24 = 4 + 1/3w + w
24 - 4 = 1/3w + w
20 = 1 1/3w
20 = 4/3w
w = 20 ÷ 4/3
w = 20 × 3/4
= 60 /4
w = 15 miles
Miles walked on Tuesday = 1/3w
= 1/3 × 15
= 15/3
= 5 miles
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