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Ratios and Rates Questions ~ Please Help (Urgent)
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Question 1: a/b=b/c=5 Question 2: On a map of R.F. 1:300 000, a park measures a dimension of 4cm x 3cm. What will be its dimension on another map of R.F. 1:75 000? Thank you for your help. 更新: Question 3: A car park charges $45 for the first 2 hours and $12 for each additional hour. Find the number of parking hours if the average parking rate is $15.5/h.
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最佳解答:
1) a/b=5 So a:b=5:1 b/c=5 So b:c=5:1 Then, a : b : c 5 : 1 ----5 : 1 ------------- 25 : 5 : 1 2) 1:300000 is the same as 1cm to 3km. So the actual dimension of the park is: 12km x 9km 1 : 75000 is the same as 1cm to 0.75km and this can be expressed as 4/3 cm to 1km. So the dimension on the map: ( 4 / 3 )( 12 ) x ( 4 / 3 )( 9 ) = 16cm x 12cm 2007-11-09 22:47:52 補充： Q3) Let the no. of parking hrs be t. [( 2 )( 45 ) + 12t] / ( t + 2 ) = 15.590 + 12t = 15.5t + 313.5t = 59t = 16.9 ( cor. to 3 s.f. ) So the time taken is 16.9hrs.
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