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shusha
[124]
3 years ago
10
The square of sophie's age is 16 less than joanna's age. it is also the case that joanna's age is 8 times that of sophie. how ol
d is joanna?
Mathematics
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mote1985
[20]
3 years ago
5
0
Let s be Sophie's age. Then joanna is s²+16. Joanna is also 8s, if Sophie is s. So:
s²+16=8s
s²-8s+16=0
(s-4)²=0
s=4
Sophie is 4; Joanna is 32
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