Question 1012123
Lets say the starting number is x.
He multiplied this number by 2. We now have {{{2*x=2x}}}
He added 11. We know have {{{2x+11}}}
He multiplied the number by four, we get {{{4(2x+11)=8x+44}}}
He divided this number by 10. This gives {{{(8x+44)/10}}}
This equals 10, so we equate this. {{{(8x+44)/10=10}}}
Then we can solve. {{{8x+44=100}}}
{{{8x=56}}}
{{{x=7}}}