Answer:
x=10.4
Explanation:
well 20*5=what? 20*5=100 but then x would have to be a decimal. not a tough one though.
10*x (x being 10) 10*10 would be 100 but then you would have to subtract 4 from it. it's easy. 10 *10.4 is 104.
x would = 10.4 to get this result