Based on the information given the number of stamps that they have in all is 715 stamps.
Formulate
102×(1+2+2×2)
Product or quotient
102×(1+2+4)
Sum or difference
102×(3+4)
=102×7
Product or quotient
=714 stamps
Inconclusion the number of stamps that they have in all is 715 stamps.
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