... digit of 11 5 B: The units’ digit of 5 11 The best answer is B. Column A: 11 by any power is always a number where the units’ digit is 1. Try some numbers: 11 1 = 11 , 11 2 = 12 1 and so ... is B. Rachael spends 1/ 5 + (1/ 3)(4/5), which is (1/ 5 + 4 /15 = 7 /15 ) of her allowance each month. The rest, which is (1 – 1/ 5 - 8 /15 = 4 /15 ) she saves up. 7 /15 > 4 /15 and therefore the answer ... rough. A is close to 220/340, which is 11 /17 and B is close to 50/65, which is 10 /13 . 10 divided into 13 parts is a lot bigger than 11 divided into 17 parts and therefore B is greater. Remember,...