24 out of 30 is equal to 24 out of 25

24/30＝20/25＝4÷5＝4/5

One wire has been used for 15 meters, which is just 4 meters longer than the rest. How many parts of the total length has been used?

15 (15-4 + 15) = 15 (11 + 15) = 15 (26) = 1526 A: the whole length of 1526 has been used for this wire

One wire used 18 meters, which is 5 meters longer than the rest. How many parts of the total length has this wire used?

18-5=13
18+13=31
13/31=13/31

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