Answer:
From Thursday to Friday, the change in the depth was 19/16 inches
or as a mixed number, 1 3/16 inches
Explanation:
From Monday to Thursday, the depth of a snowdrift changed by 2 3/8 inches
now, 2 3/8 = 2(8/8)+(3/8) = 16/8 + 3/8 = (16+3)/8
so, 2 3/8 = 19/8 inches = depth change from monday to thursday
From Thursday to Friday, the depth changed by half as much,
so,
depth change from Thursday to Friday = 1/2(depth change from Monday to Thursday)
depth change from thursday to friday = 1/2(19/8) = 19/16 inches