A = larger number
B = smaller number
A -B = 10
A + B = 4B
A=10+B
10+B+B = 4B
10 +2B = 4B
10=2B
B = 10/2 = 5
A = 10+5 =15
15-5 =10
15+5 = 20, 4*5 = 20
the numbers are 5 & 15
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