The lowest common multiple is 216 (D)
1x15 and 3x5 are the only problems where the answer is 15 but for 26 there is multiple multiplications where the answer is 36, those being 1x36, 3x12, 4x9, 6x6 (all squares are rectangles but not viceversa), and 2x18
Answer:
C seems right
Step-by-step
seems more work then needs be but 7+5= 12 and she originally had 23. so the equation of adding the 7+5 would just be adding up the ones removed together then adding the -23 to the equation is how many Amy had to begin with. so it would be <u><em>23-7+5 </em></u>= 12. others dont seem right since when you add () to an equation that means your multiplying and you wouldn't be multiplying here and for D to be right it needs to be switched around or you'd end up with a - number and she wouldn't have a - number of blocks. just divide up a problem if need be and break it down to smaller parts to make it easier to deal with.