Maths
posted by Joel .
Mr Zubir bouught a pair of pants, a shirt and a coat. The pair of pants and shirt costs $100.90. The pants and coat costs $244.50. The coat costs 5 times as much as the shirt. How much did Mr Zubir pay for his coat?

pp+s=100.90
pp+c=244.50
c=5s
We solve this system
From the 1st s=100.90pp, from the 2nd pp=244.50c => s=100.90244.50+c=c143.60
c=5s=5(c143.60)=5c718
4c=718 
That was not the answer the teacher gave. It was $179.50 for the coat. How do I get this answer?

Divide last equation by 4 c=718/4=179.5

ok, thanks. I get it now.