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I worked on it for about an hour and couldn’t get it either. Maddening, huh. After that, I cheated and googled it. I don’t want to spoil it if you want to keep working, but here is a website with the answer. For just a hint, think about having a fraction under a fraction.

how? i tried many ways of getting 16 with four operation but i did not know. can i ask how and what way?

I worked on it for about an hour and couldn’t get it either. Maddening, huh. After that, I cheated and googled it. I don’t want to spoil it if you want to keep working, but here is a website with the answer. For just a hint, think about having a fraction under a fraction.