SOLUTION: the difference of two numbers is 4.if 7 is added to the bigger number,the result will be two times the smaller number.find the big number among two.

Question 878856: the difference of two numbers is 4.if 7 is added to the bigger number,the result will be two times the smaller number.find the big number among two.
Answer by JulietG(1812) (Show Source): You can put this solution on YOUR website!
A = B + 4
A + 7 = 2B
Substitute the known value of A from the first equation into the second.
(B+4) + 7 = 2B
Add
B + 11 = 2B
Subtract B from each side.
11 = B
.
If B is 11, then A must be 4 more, or 15.
15 + 7 is indeed twice 11.
Success!
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