39 is 25% of 156.
Work: 156 x 0.25 = 39 which means that 25% of 156 is 39.
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The correct answer would be the last option D
0.5 x 4 = 2 feet / 2 feet in 4 seconds
15 - 2 = 13
New depth: 13 feet
0.4 x 3 = 1.2 feet / 1.2 feet in 3 seconds
13 - 1.2 = 11.8
New depth: 11.8 feet
