let X = number
X + 1/2 X = 21
1.5 X = 21
X = 14
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24 is.
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) = 621x(4.5) = 621x = 621/4.5x = 138Therefore the required number is 138.Source: www.icoachmath.com
Yes. Every number is equal to itself (and to no other number).
12.2474487
Its 11