IKMC 2012 - Grades 5-6 - Self-study Question 7

Question 7

To the number 6 we add 3. Then we multiply the result by 2 and then we add 1. Then the final result will be the same as the result of the computation

$(6+3\cdot2)+1$
$6+3\cdot2+1$
$(6+3)\cdot(2+1)$
$(6+3)\cdot2+1$
$6+3\cdot(2+1)$