67

Решение:

• \( 5 \cdot 7 = 35 \)
• \( 7 \cdot 4 = 28 \)
• \( 6 \cdot 7 + 6 = 42 + 6 = 48 \)
• \( 3 \cdot 4 + 11 = 12 + 11 = 23 \)
• \( 6 \cdot 7 + 8 = 42 + 8 = 50 \)
• \( 7 \cdot 8 - 26 = 56 - 26 = 30 \)