Jeanne Louise Calment of France lived to be the oldest human on record. Mitoyo Kawate of Japan lived 8 years less than Calment. If the sum of their ages is 236 years, how old was Calment when she died?
let: Jeanne's age be x
Mitoyo's age be x-8
Since Jeanne's + Mitoyo's age = 236,
x + x - 8 = 236
2x = 236 + 8
2x = 244
x = 244/2
x = 122
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