Okay this is how you count by 3's...
3,6,9,12,15,18,21,24,27,30,33,and so on...
JUST KEEP ADDING 3 EVERY TIME AND YOU WILL DO IT !!!!!!!!!!!!
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It is only because we count in tens - and 5 10 and 2 are factors.
3s + 1
3S Facility simply means sales, services and spares
To find out how many 3s go into 140, divide 140 by 3. This gives you approximately 46.67. Since we're looking for whole 3s, you can fit 46 complete 3s into 140.
12r - 15s - r + 3s = 11r -12s