Question
Jack had two rolls of papers of the same length. He cut one roll into equal pieces of length 30 cm. In each piece he wrote the word 'will' as shown in Figure 1. After that, he cut the other roll into equal pieces of length 1.6 m and and in each piece, he wrote the word 'benefit' as shown in Figure 2. When he finished writing, he counted that there were 39 more words in the first roll than the second roll. If all the letters are spaced equally, how many letters were there altogether?
4 m

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Jack had two rolls of papers of the same length. He cut one roll into equal pieces of length 30 cm. In each piece he wrote the word 'will' as shown in Figure 1. After that, he cut the other roll into equal pieces of length 1.6 m and and in each piece, he wrote the word 'benefit' as shown in Figure 2. When he finished writing, he counted that there were 39 more words in the first roll than the second roll. If all the letters are spaced equally, how many letters were there altogether?