Oranges are 30 fewer than apples. The total is apples + oranges.
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• Oranges → 790 − 30 = 760
• Altogether → 790 + 760 = 1550
He has 1550 oranges and apples altogether.
Check: 790 − 760 = 30 fewer oranges, and 790 + 760 = 1550. ✓