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bonufazy [111]
3 years ago
15

How may shells does Joshua have?

Mathematics
2 answers:
Nikitich [7]3 years ago
6 0
Joshua has 12 shells

k+ j=54
k +(k-30)=54
k+k=84
2k=84
k=42

j=k-30
j=42-30
j=12


double check 
12+42= 54!!
Tpy6a [65]3 years ago
5 0
24, since 54-30 is 24, and 30+24 is 54.
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