It is: 2*80 = 160
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It is 80.
Twice, with two left over.
twice 40 goes into 80 twice so it goes into 90 twice with 10 left over.
If you mean: 5, 10, 20, 40 then the following number is twice the previous number which will be 80
38 and 42 is 80 stamps. Twice 80 is 160 minus 8 is 152 38 plus 42 plus 152 is 232.