"<span>Bob spent twice as much as James, who spent four times as much as Nava"
Bob: b</span>
James: j
Nava: n
Bob spent twice as much as James: b=2j
<span>James spent four times as much as Nava: j=4n</span>
<span>Bob and James together spent $180: b+j=180
but we have: b=2j
</span><span> -------------------
</span> <span> 2j+j=180
</span> <span> 3j=180 >> j=60$
</span> <span> b=2j=120$</span>
Recall this: <span>j=4n >>>> 60=4n >>>>>n=15$</span>
SO far we calculated how much everyone spent
I hope that
helps!