Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 7)
If the ratio of length to width of a rectangle is 3:1, and the perimeter is 24cm, what is the length?
3cm
6cm
9cm
12cm
คำอธิบาย
L:W=3:1. (3+1) * 2 = 8. Then 24/8 = 3, then 3*3 = 9cm