Answer :

Answer: 3.5

2/w=0.57
2=w(0.57)
2/0.57=w
w=3.5
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2/w=0.4/0.7
0.4w=0.7(2) (cross multiply)
0.4w=1.4
w=1.4/0.4

w= 3.5
 

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