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Hey!!!
Solution,
2x+2x+3x=77
or,7x=77
or,X=77/7
X=11
Replacing value,
2x=2*11
=22
3x=3*11
=33
So, Brian gets £ 22.
Kritika gets £ 22
Peter gets £ 33
Hope it helps...
Good luck on your assignment
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