Asked by Jeanie
A boy weighs three times as much as his younger sister. If both of them together they weigh 80 kilograms, what is his sisters weight
Answers
Answered by
Damon
b + s = 80
b = 3 s
so
3 s + s = 80
4 s =80
s = 80/4
b = 3 s
so
3 s + s = 80
4 s =80
s = 80/4
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