If each one of the ropes will break

If each one of the ropes will break when it is
subjected to a tensile force of 450 N, determine the
maximum uplift force F the balloon can have before one
of the ropes breaks.

Results (English) 3:

如果每一个绳子将打破时，它是受450 N的拉伸力，确定气球可以在一个之前的最大上拔力F断绳。