Mathematics for IGCSE & O level - Ratio And Proportion (Section 6 - No. 3)
If the cost of 5 oranges is $3, which statements are correct?
The cost of 10 oranges is $6.
The cost of 1 orange is $0.60
The cost of 20 oranges is $9.
The cost of 15 oranges is $6.
설명
1 orange=$3/5 = $0.60; 10 oranges = 10*0.6=6, and 15 oranges will be 9.