Suppose on monday, you made x toys..

then on tuesday, you made x+2 toys

on wednesday, you made (x+2)+2 = x+4 toys

on thursday, you made (x+4)+2=x+6 toys

on friday you made (x+6)+2 = x+8 toys..

during the 5-day work week(monday to friday), you made 45 toys means

x+ x+2 + x+4 + x+6 + x+8 = 45

So, the number of toys you made on thursday would be....