Nine divides into 180 twenty times.
Exactly 20 times
3 with remainder 9.
(-4*9)*-5 = 180
9 x 20 = 180
The number of zeros is determined by how many times 12 divides into 15!. To determine this, since 12 = 22*3, we will look at how many times 2 and 3 divide into 15!. 2 divides 2,6,10,14 once, 4,12 twice, and 8 three times, so that 2 divides 15! exactly 11 times. 3 divides 3,6,12,15 once and 9 twice, so that 3 divides 15! exactly 6 times. From this, we can see that 12 divides into 15! exactly 5 times, since 125=210*35. In other words, the base-12 representation of 15! ends in 5 zeros.
Exactly 9 times
Exactly 20 times
20 times 9 is 180.
3 with remainder 9.
There are: 20 times 9 = 180 square feet
180 x 9 = 1620
4 x 5 x 9 = 180
20 = 180 / 9
20
the answer is 5
61000 ÷ 180 = 338 160/180 = 338 8/9 ≈ 338.89
180