Answer:
there is no solution 64x-16=64x-16
Step-by-step explanation:
if you distrubute then you will see the numbers are the same on both sides
Try this solution:
let the unknown two-digits number be 'xy'.
Then it is possible to write any two-digit number as 10x+y, where x - the tens digit and y - the unit digit.
Using the rule described above the phrase 'the tens digit of a number is twice the units digit' may be written as x=2y.
Using the same rule the phrase 'if the digits are reversed, the new number is 36 is less than the original number' may be written as (10x+y)-(10y+x)=36.
These two equations may be resolved as system of two equations:

Check: the original number is 84, the new number is 48; difference is 84-48=36.
answer: 84
If order doesn't matter (e.g. all the positions in the committee are essentially identical) then the number of possible choices is

.
Answer:
x= 42.5°
The angle shown in the figure is a right angle.
x+3x+10=180°
=>4x= 170°
=>x= 170/4= 42.5°