Given that pq=23 and up=1/23
But question is asking to calculate value of u*q*v*p. which doesn't contains variable "p"
So it seems that you mistyped the equation up=1/23
it should be uv=1/23
Now i will show you how to evalueate u*q*v*p
In given equation pq=23, p and q are together so first we need to rearrange the letters
u*q*v*p
= u*v*q*p {commutative property of multiplication}
= u*v*p*q {commutative property of multiplication}
= (uv)*(pq) {applied parenthesis just for easiness}
Now plug the given values
= (23)*(1/23) {multiplication}
= 23/23 {division}
= 1
Hence final answer is 1.