A perimeter: b perimeter = A radius: b radius = 2: 3.

Area a: area B = the square of radius a: the square of radius b = 4: 9.

One of them is 18.

Maybe this is an area of ... A: 18 = 4: 9, so it is 8.

It's probably the best ...18: Zone B = 4: 9, Zone B 40.5.

the second question

A produces half of the sum of B and C ... A accounts for one third of the total.

B produces a third of the sum of A and C ... B accounts for a quarter of the total.

A+B+C = total amount

Let the total amount be a.

a/3+a/4+2400=a

Solve a=5760 pieces

There are 5760 toys in this batch.