Hi there!
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I believe your answer is:
520 students.
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Here’s why:
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60% of the 1300 students passed. This means that 40% of the students failed.
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![1300 * 0.4= 520](https://img.qammunity.org/2022/formulas/mathematics/high-school/s6r6w5a2ph79dw9j2l409avumepz28ztox.png)
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520 students failed school.
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![\boxed{\text{Another way to find this...}}\\\\\text{Take 60}\% \text{ of 1300:}\\\\1300 * 0.6 = 780\\\\\text{780 students passed school.}\\\\\text{Subtract 780 from 1300:}\\\\1300 - 780 = \boxed{520}](https://img.qammunity.org/2022/formulas/mathematics/high-school/nztuwmnjvy4qflbn5zojnha4m1biliqwb6.png)
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Hope this helps you. I apologize if it’s incorrect.