Question

Please say the correct answer. If you are here to troll fukc off

Answer 1

40% of 60% of some number is 8.

Let n = the original number.

Now, we'll translate the given English sentence into an equation to be solved for n:

.40[(.60)n] = 8

(.40)(.60)n = 8

.240n = 8

(.240n)/.240 = 8/.240

(.240/.240)n = 8000/240

(1)n = 8000/240

n = 33 and 1/3

CHECK:

.40[(.60)n] = 8

.40[(.60)(33 1/3)] = 8

(40/100)[(60/100)(100/3] = 8

(2/5)[(3/5)(100/3)] = 8

(2/5)[300/15] = 8

(2/5)(20/1) = 8

40/5 = 8

8 = 8

Answer 2

$\huge\red{Answer}$

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☆☞ [ Verified answer ]☜☆

$To \: know \: the \: unit \: digit, \\ we \: need \: to \: see cyclicity \: of \: unit \: digit \: of \:  1 \: 7181718. \\ </p><p></p><p>As (17)18(17)18 has 77 at unit place, \\ </p><p></p><p>71≡7(mod10)71≡7(mod10) \\ </p><p></p><p>72≡9(mod10)72≡9(mod10) \\ </p><p></p><p>73≡3(mod10)73≡3(mod10) \\ </p><p></p><p>74≡1(mod10)74≡1(mod10) \\ </p><p></p><p>75≡7(mod10)75≡7(mod10) \\ </p><p></p><p>So 77 has cyclicity of 4,4, \\ </p><p></p><p> \\ 718=74×4+2≡9(mod10)718=74×4+2≡9(mod10) \\ </p><p></p><p>∴9∴9 will be at unit digit \\ of 718718</p><p> \\ </p><p>:)</p><p></p><p>$

jai siya ram☺ __/\__

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