4. There are two ropes of the same length. The first one uses 42 meters, and the second one uses 12 meters. The remaining length of the second rope is exactly 4 times the remaining length of the first rope. The original total length of the two ropes is $\qquad$ meters.
【Answer】104

【Solution】Difference multiple problem. The length of the remaining rope of the second one is 30 meters longer than that of the first one: $42-12=30$ (meters), so the one-fold number is the length of the remaining rope of the first one: $30 \div(4-1)=10$ (meters), the first one is $10+42=52$ (meters), the second one also has 52 meters, so the total length of the two ropes is $52+52=104$ (meters)