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  1. Rachel Lucky on January 8, 2013 at 8:43 am

    I need help with this please:
    A school buys two types of pen. One (x) costs $9 each while the other (y) cost $30. They bought 74 and paid $1170 how many of each type were bought?

    • amelia.britto on January 17, 2013 at 7:25 am

      Hi, You can use algebra to solve this problem.
      Here x=9, y=30
      From the given information
      x+y=74, so, y=74-x
      Also, 9x +30y=1170
      So, 3x +10y=390
      3x +10(74-x)=390
      3x+170-10x=390, so, 7x=350. Hence, x=50, y=24…Therefore, the answer is that the school buys 50 of type “x” pens and and 24 of type “y” pens.

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