Thirteen plums weigh as much as two apples and one pear. Four plums and one apple have the same weight as one pear. How many plums have the weight of one pear?
Let L represents Plums, A represents apples and P represents pears.
13L = 2A+1P
4L+1A=1P
1A=1P-4L
13L=2(P-4L)+1P
13L = 2P - 8L + 1P
13L+8L = 3P
21L=3P
7L=P
7 plums have the weight of one pear.
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