Two large, two small. One child is 170cm tall, and the other is 105cm. How to buy tickets most advantageously? Thank you.

Two adults buy two adult tickets: 60×2=120 yuan, a child of 170 cm buys one youth ticket: 30 yuan. A child of 105 cm is exempt from the ticket.
Retirees are free of charge, children under 1.4 meters are free, and retired elders are free of charge.
Children aged 6-18 can purchase children’s tickets, and children under 6 are free of charge. If both children are over 6 years old, purchasing two tickets, one adult and one child, is the most cost-effective.
Two adults buy two adult tickets: 60 × 2 = 120 yuan, a child of 170 cm buys one youth ticket: 30 yuan. A child of 105 cm is exempt from the ticket.
Veterans are free of charge, children under 1.4 meters tall are free, and retired elderly are free of charge.
Children aged 6-18 can purchase children’s tickets, and children under 6 are free. If both children are over 6 years old, buying two tickets—one adult and one child—is the most economical option.