If you increase the length and width of a cuboid by 1 / 3 respectively, what is the area of the cuboid now? What do you find? I know it's 16 / 9. Please reply as soon as possible

If you increase the length and width of a cuboid by 1 / 3 respectively, what is the area of the cuboid now? What do you find? I know it's 16 / 9. Please reply as soon as possible

(1+1/3)×(1+1/3)÷(1×1)
=4/3×4/3÷1
=16/9
The results showed that: 1
Increase 1 / 3 is to expand 4 / 3 times, rectangular length and width respectively x times, the area will expand x times