Question 991756
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S=smallest integer; M=middle integer=S+2; L=largest integer=S+4
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M+L=S+21
S+2+S+4=S+21
2S+6=S+21
S=15
M=S+2=15+2=17
L=S+4=15+4=19
ANSWER: The integers are 15, 17, and 19.
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CHECK:
M+L=S+21
17+19=15+21
36=36