It's easy if you just break it into pieces...
1/3 OF the 4/9 French OF people on the bus (27) also speak German.
Of= Multiply
1/3*4/9*27/1=4 speak French AND German
9 divided by 13 = 9/13
None of the answer above
Should be: 9 • 1/13
A.

B.

Megan's solution isn't correct.
The first mistake: she subtracted 5x from the right-hand side of the equation, but added 5x to the left-hand side.
The second mistake: she divided the right-hand side of the equation by 11, but didn't divide the left-hand side.
The correct solution:
Answer:
10k.
Step-by-step explanation:
1) if for the 1st position can be used 0-9 digits (10 digits), for the 2d - 0-9 digits, for the 3d - 0-9 digits and for the 4th - 0-9 digits, then
2) the required number of pwd is: 10*10*10*10=10⁴=10000.