Unknown number

15% of the unknown number is 18, less than 21% of the same number. What is the unknown number?

Correct answer:

x =  300

Step-by-step explanation:

a=15%=10015=203=0.15 b=21%=10021=0.21  a x=b x18 0.15 x=0.21 x18  0.06x=18  x=0.0618=300  x=300



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