let the percentage of gallium 69 =x
percentage of gallium 71=100-x
mass of gallium 71= 70.59
let the mass of gallium 69=68.9257
atomic mass of gallium from the periodic table = 69.723
"69.723=\\frac{68.9257x +70.59(100-x)}{100}"
"6972.3=68.9257x-70.59x+7059"
"1.6643x=86.7"
"x=52.09\\%"
percentage of gallium 61=52.09"\\%"
percentage of gallium 71 = 100-52.09=47.91"\\%"
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