Answer:
b 5,400 ÷ 60
Explanation:
knoweth thay multiplication table.
what are the multiples of 9 ?
1×9 = 9
2×9 = 18
3×9 = 27
4×9 = 36
5×9 = 45
6×9 = 54
7×9 = 63
8×9 = 72
9×9 = 81
10×9 = 90
because multiples of 10 follow the same structure, we just add 0s.
so, the multiples of 90 are the same numbers as above, they just have a 0 at the end.
and if we also multiply the first numbers (1 ..10) by 10, the results get a second additional 0 at the end.
so, when we look at
3600
5400
6400
7200
we actually look at
36
54
64
72
36 = 4×9
so, 3600 has to be divided by 40 to result in 90.
but it is divided by 50. so, no.
54 = 6×9
so, 5400 has to be divided by 60 to result in 90.
and it is. so, yes ! 5400 ÷ 60 = 90
64 is no factor of 9 at all. so, no.
72 is 8×9
so, 7200 has to be divided by 80 to result in 90.
but it is divided by 90. so, no.