Question 957041
QUESTION 1) 15% off means you pay 85% of the original price. 0.85($530)=$450.50 
ANSWER 1: The couch would cost $450.50 during the sale. 
QUESTION 2) 3 of 5 are girls so 3/5 are girls: 3/5(30)=18 girls
ANSWER 2: There are 18 girls in the class.  
QUESTION 3) (3mi/18min)(60min/1hour)=10mi/hr
ANSWER 3:Mark can run 10 miles in one hour.
QUESTION 4) (1,000,000,000km/yr)(1 year/52weeks)=19,230,769 km/wk
ANSWER: The earth travels 19,230,769 km/wk.