Question #2) The answer is B , because if you multiple them the left side of the equal sign, it gives a product of 54, while the right side of the equal sign (9 X 3) it equals to 27.
Therefore, 54 & 27 does not equal each other, which makes it "NOT true".
Question #3) The answer is 70.
Because, there is 7(children) X 5 ( sandwiches) = 35
35 (total sandwiches) X 2(slices of bread each sandwich needs) = 70 (slices of bread needed)