Calculate Total Remaining Pencils: 15 - 2 and 17 - 2 Combined

To solve this problem, we'll address each part step-by-step and verify at each stage:

• Step 1: Determine how many pencils Jonathan has after giving away pencils.
• Step 2: Determine how many pencils Daniel has after giving away pencils.
• Step 3: Add the remaining pencils of Jonathan and Daniel to find out how many they collectively have left.

Let's proceed through the steps:

Step 1: Jonathan has 15 pencils originally. He gives 2 pencils to Betty. Therefore, his remaining number of pencils is: $15 - 2 = 13$

Step 2: Daniel has 17 pencils originally. He gives 2 pencils to Betty. Therefore, his remaining number of pencils is: $17 - 2 = 15$

Step 3: To find the total number of pencils Jonathan and Daniel have left, we add their remaining pencils together: $13 + 15 = 28$

Therefore, Jonathan and Daniel have altogether $28$ pencils left.