Two numbers are in the ratio 4:5 and their L.C.M. is 180. The smaller number is
1). 9
2). 15
3). 36
4). 45
Let the numbers be 4x and
5x.
Their LCM = 20x
According to the question,
20x = 180
$\Rightarrow$ x=9
$\therefore$ Smaller number
= 4x = 4 × 9 = 36