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Anonymous
let x = first number, y = second.
x+y = 155
x-y = 11
add the two equations
2x= 166
x = 83
y = 72
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31 x 5 150 + 5 160 - 5 775 ÷ 5
1 x 155, 5 x 31 = 155
17.2222
5*31=155
155