Answer:
We need to find a number which increased by 3.5 of itself equals 621.
Let that number be x.
x increased by 3.5 of itself equals 621 implies x+ 3.5x = 621.
x(1+3.5) = 621
x(4.5) = 621
x = 621/4.5
x = 138
Therefore the required number is 138.
Source: www.icoachmath.com
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62.5 = 625/10 = 621/2
621 is divisible by 9?
1 x 621, 3 x 207, 9 x 69, 23 x 27, 27 x 23, 69 x 9, 207 x 3, 621 x 1 = 621
No, any number which is perfectly divisible by 9 has its digits equal to a multiple of 9. The closest multiples of 9 to 615 are 612 and 621. (68 x 9 and 69 x 9 respectively).
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