Find the smallest 4-digit number that is divisible by 20 and 60. Also find a number closest and
less than 3000 that is divisible by them.

can ignore 20 as 60/20=3, ie divisible

so basically find the smallest 4 digit number divisiable by 60

1000 / 60 = 16.xx

so to round it up to 17 => 17*60=1020

similarly for 3000, you use 3000/60 first, which is 50

so you want a smaller number ie 49, so 49*60=2940

Step-by-step explanation:

50=33x+22

step-by-step explanation: