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If its just a simple case of using 5 in an equation to get to 49 then you just multiply it by 9.8.

5 X 9.8 = 49

However if you have to get to 49 only using the number 5 (using any number of expressions):-

5 X 5 X 5 X 5 = 625

625 - 5 = 620 "

620 / 5 = 124

124 / 5 = 24.8

24.8 - 5 = 19.8

19.8 - 5 = 14.8

14.8 - 5 = 9.8

9.8 X 5 = 49

"You can take the square root of 620 to get 24.899. But when you round it up you will get 24.9 which isn't what you want - therefore I have stuck with dividing it by 5 two times.

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Q: How do you get to 49 using only 5?
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