Question:
Dylan had three boxes, A, B and C, containing a total of 1512 stamps. The number of stamps in Box A is 2/7 of the total number of stamps. Dylan sold 190 stamps from Box B and sold 1/4 of the stamps in Box C.
The number of stamps left in Box B was twice the number of stamps left in Box C. How many stamps were there in Box B at first?
Solution:
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