Is it even possible?

本文由 Au Yeung Yat 在 2014-12-25 發表於 "數學" 討論區

  1. 57589507

    Au Yeung Yat
    Expand Collapse

    文章:
    7
    讚:
    0
    In Ch.4 Challenge 4,the question is Jim spent $111 in the supermarket to buy oranges, apples and mangos. Oranges cost $2 each, apple cost $3 each and Mangos cost $5 each. If the number of oranges, apples and mangos he bought is 32 and he bought two times more apples than oranges, then how many of each fruit did he buy.The main point is that is it even possible to solve it?
    Calculations:
    |2x+3y+5z=111(1)
    |x+y+z=32(2)
    |2y=x(3)
    From (2)
    5x+5y+5z=160(4)
    (4)-(1)
    3x+2y=49
    4x=49 which doesn't makes sense.
     
    #1 Au Yeung Yat, 2014-12-25
  2. 57384791

    nickname-spa-190910
    Expand Collapse

    文章:
    3
    讚:
    0
    You are wrong
    The question "she bought 2 times more apples than oranges", that means apples = 3 * apples, since it is "2 times more", not "2 times".
     
    #2 nickname-spa-190910, 2015-02-20