Given:
a.) A bookstore had 96 copies of magazines yesterday it’s sold 1/4 of them today.
b.) It sold 1/3 of what remained.
Let's determine how many copies of the magazines are left.
Step 1: A bookstore had 96 copies of magazines yesterday it’s sold 1/4 of them today.
![\text{ 96 x }(1)/(4)\text{ = }(96)/(1)\text{ x }(1)/(4)\text{ = }(96)/(4)\text{ = }24](https://img.qammunity.org/2023/formulas/mathematics/college/vx62xplxch4ucxqr6m3zg8cshmsydk3a5k.png)
Remaining copies = 96 - 24 = 72 magazines
Step 2: It sold 1/3 of what remained.
![\text{ 72 x }(1)/(3)\text{ = }(72)/(1)\text{ x }(1)/(3)\text{ = }(72)/(3)\text{ = }24](https://img.qammunity.org/2023/formulas/mathematics/college/vpgo06o67f4kh08u20psy00l887fl43ek4.png)
Remaining copies = 72 - 24 = 58 magazines
Therefore, 58 copies of magazines are left.
The answer is 58.