Two thousand, nine hundred forty.
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The greatest common factor of 2940 and 3150 is 210. Source: http://www.mathwarehouse.com/arithmetic/numbers/GCF/greatest-common-factor-calculator.php
420
To determine if 2940 is divisible by a number, we need to check if it can be divided evenly by that number without leaving a remainder. 2940 is divisible by 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420.
A factor is a divisor - a number that will evenly divide into another number. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 462 are 1, 2, 3, 6, 7, 11, 14, 21, 22, 33, 42, 66, 77, 154, 231, and 462. The factors of 2940 are 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 420, 490, 588, 735, 980, 1470, and 2940. The common factors are 1, 2, 3, 6, 7, 14, 21, and 42. This would mean that the greatest common factor is 42.
Assuming that Charlie increased his account by 5% and not 5, they had 2800 in May and 2940 in June.