dat math Q38

[nona]

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can someone please explain to me how to solve Q38 Test 9 in DAT math destroyer I would really appreciate it because the answer is not explained with the answers for some reason they explained Q40 instead🙁

 

[silveryhair]

I havent got there, but I looked at the problem and the answer should be 1/2. Let me know if u need an explanation.

It follows the Log division rule

Log x - log y = log x/y

Destroyer has the answer as D, but it the correct answer is A. If you don't believe me, plug it into a calculator 😉

 

[NewBee12]

Log(28) - Log(7x) = Log(8)
Log(28/7x) = Log(8)

which means : 28/7x = 8
now solve for x
x= 28/56 = 1/2 😀

good luck

 

[nona]

thanks newbee12 and silveryhair