Question 331465
16) christine paid 60% of retail price or Rp
.6x=53.40  solve 
x=53.40/.6
x=534/6=89
original price=$89
she paid 53.40 subtract to get savings
89.00
53.40
_----
35.60
Christine saved $35.60

17) 1.15x=48000  x+.15x=48000 where x=oringinal 
    x=48000/1.15
x=41,739.13

18) length=3+width
    l=3+w
P=2l+2w=30
P=2(3+w)+2w sub
P=6+2w+2w
P=6+4w=30
subtracting 6 we get 
4w=24  divide by 4
w=6 then l=w+3=9
w=6,l=9 answer
19) second angle=x
    first angle=2x
    third angle=x+20  so x+2x+x+20=180 4x=160 divide by 4 second angle=40
first=2*40=80
second=40
third=20+40=60
20) d1=3t
    d2=2.5t
D=1 mile
D=d1+d2=3t+2.5t=1hr and t is in hours
5.5t=1 so t=1/5.5=.181818hrs  multiply by 60 to convert to minutes
10.9minutes nearest minute 11   answer 11 minutes

I hope this helps, good luck and check your answers:)
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