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There is 55 left from 100 if 15 is subtracted from it three times. This is because 15 times three is 45, and 100 minus 45 is 55.
100
Two times less than 100 would be 50. When you say something is "two times less," you are essentially subtracting twice the value from the original amount. In this case, 100 minus 2 times 50 equals 50.
Once! After you have subtracted it once, you are subtracting 100 from 1900, and then 100 from 1800 and on and on
100 is not divisible by three.
If you divide 100 by 5 you get 20 and three times 20 = 60.