Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 42)
If the cost of 6 oranges is $4.20, which is/are correct?
The cost of 1 orange is $0.70
The cost of 10 oranges is $7
The cost of 15 oranges is $10.50
The cost of 3 oranges is $2.40
설명
1 orange = $0.70; 10 oranges = 7, 15 oranges = 10.50