a plastic bag of negligible mass contains pears .oranges and

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a plastic bag of negligible mass contains pears .oranges and apples.The number of pears is 1/3that of apples while there are twice as many oranges as there are apples.There are 25more oranges than pears.It is assumed that the masses of each apple,each orange and each pear are 127g,132g and 138g respectively.
calculate the total number of fruit in the plastic bag?

设PEAR的个数为X
APPLE个数就为3X
there are twice as many oranges as there are apples
表明APPLE个数是ORANGE的2倍
ORANGE个数为1.5X
1.5X-X=25
X=50
P=50 O=75 A=150
P+O+A=275
= =///水果的重量貌似没有用上啊

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