Unknown number

Find an unknown number of which 1/5 is 40 greater than one-tenth of that number.

Correct answer:

x =  400

Step-by-step explanation:

1/5 x=40+x/10  1/5 x=40+x/10  x=400  x=1400=400  x=400

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Triple the number 8 is greater than an unknown number

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