Increase 5366

I think the number. If I increase it by 25%, I get the number 100. What number do I think?

Correct answer:

x =  80

Step-by-step explanation:

x + 25/100 x = 100

x + 25/100·x = 100

125x = 10000

x = 10000/125 = 80

x = 80

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