Question
Justin had two rolls of papers of the same length. He cut one roll into equal pieces of length 20 cm. In each piece he wrote 4 letters 'must' as shown in Figure 1. After that, he cut the other roll into equal pieces of length 1.5 m and and in each piece, he wrote 7 letters 'conquer' as shown in Figure 2. When he finished writing, he counted that there were 92 more letters 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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Justin had two rolls of papers of the same length. He cut one roll into equal pieces of length 20 cm. In each piece he wrote 4 letters 'must' as shown in Figure 1. After that, he cut the other roll into equal pieces of length 1.5 m and and in each piece, he wrote 7 letters 'conquer' as shown in Figure 2. When he finished writing, he counted that there were 92 more letters in the first roll than the second roll. If all the letters are spaced equally, how many letters were there altogether?