To find the sum of 16 and 57, add the units digits and carry over any extra tens, then add the tens digits with the carried value to obtain the answer, which is 73 (option c).
The question is asking for the sum of two numbers: 16 and 57. When you add these two numbers together, you get 73. Here's how you do it step by step:
Write down the numbers one above the other, aligning the units digits:
16
+57
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Add the units digits (6 + 7) to get 13. Write down 3 and carry over 1.
16
+57
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3 (carry 1)
Add the tens digits (1 + 5) along with the carried 1 to get 7.
16
+57
---
73
The sum is 73, which corresponds to option c.