1 times 225
3 times 75
5 times 45
9 times 25
15 times 15
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225 cannot be factorised into the product of only 3 prime numbers.
450
(-225,1)(-75,3)(-45,5)(-25,9)(225,-1)(75,-3)(45,-5)(25,-9)(-15,15)
7.5% of 225= 7.5% * 225= 0.075 * 225= 16.875
That sounds like: if you multiply it by 16, the result is the same as if you add 225 to it. You can write this as an equation - calling the number "x" - as follows: 16x = x + 225 Solve this equation, and you have your number.