Mathematics for IGCSE & O level - Proportion (Section 1 - No. 43)
The number of apples you can buy with a fixed amount of money varies inversely with the price of each apple. If you can buy 10 apples when each apple costs $1, how many apples can you buy if each apple costs $2?
2
5
10
20
คำอธิบาย
n= k/p, 10= k/1, k=10. n = 10/2 = 5