Mushrooms

For five days, we have collected 410 mushrooms. Interestingly every day we have collected 10 mushrooms more than the preceding day. How many mushrooms we have collected during 4th day?

Correct result:

x =  92

Solution:

(x-30)+(x-20)+(x-10)+(x)+(x+10)=410

5x = 460

x = 92

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