Answer:
5/3
Step-by-step explanation:
"of" means times so so so often. It is not a hard math rule/definition. But more like a soft English-Math translation.
So, "2/5 of what"
means 2/5x (but make sure the 2/5 is a fraction beside the x, NOT the x on the bottom with the 5)
"is" means equals.
2/5x = 2/3
Multiply both sides by 5/2.
5/2 • 2/5x = 2/3•5/2
x = 2/3 • 5/2
x = 5/3
You get 5/3 either by "cancelling" the 2's OR by
fraction multiplication where you times top×top and bottom×bottom and simplify.
x = 10/6
x = 5/3
2/5 of 5/3 is 2/3.
The "what" in the question is 5/3.