Solve the following problems involving length. 1. A man bought 39m 60cm of ribbon and 22m 28cm the same day. What is the total ribbon bought? 2. A seamstress has 6m 40cm of cloth and needs 3m 25cm. Ho

Step 1: Solve .
A man bought 39m 60cm of ribbon and 22m 28cm the same day. To find the total ribbon bought, add the two lengths.

$$39 \text{ m } 60 \text{ cm} + 22 \text{ m } 28 \text{ cm}$$

Add the meters: $39 \text{ m} + 22 \text{ m} = 61 \text{ m}$
Add the centimeters: $60 \text{ cm} + 28 \text{ cm} = 88 \text{ cm}$
The total length is $61 \text{ m } 88 \text{ cm}$.
The man bought $\boxed{\text{61 m 88 cm}}$ of ribbon.

Step 2: Solve .
A seamstress has 6m 40cm of cloth and needs 3m 25cm. To find the remaining cloth, subtract the needed amount from the total.

$$6 \text{ m } 40 \text{ cm} - 3 \text{ m } 25 \text{ cm}$$

Subtract the meters: $6 \text{ m} - 3 \text{ m} = 3 \text{ m}$
Subtract the centimeters: $40 \text{ cm} - 25 \text{ cm} = 15 \text{ cm}$
The remaining cloth is $3 \text{ m } 15 \text{ cm}$.
The remaining cloth is $\boxed{\text{3 m 15 cm}}$.

Step 3: Solve .
Deji has four pieces of string, each 5m 42cm long. To find the total length, multiply the length of one string by 4.
Convert 5m 42cm to centimeters: $5 \times 100 \text{ cm} + 42 \text{ cm} = 500 \text{ cm} + 42 \text{ cm} = 542 \text{ cm}$.
Multiply by 4:

$$542 \text{ cm} \times 4 = 2168 \text{ cm}$$

Convert back to meters and centimeters: $2168 \text{ cm} = 21 \text{ m } 68 \text{ cm}$.
The total length of the four strings is $\boxed{\text{21 m 68 cm}}$.

Step 4: Solve .
Three pipes of 8m 34cm, 10m 53cm, and 12m 38cm are joined. To find the total length, add the lengths of the three pipes.
Convert all lengths to centimeters:
$8 \text{ m } 34 \text{ cm} = 834 \text{ cm}$
$10 \text{ m } 53 \text{ cm} = 1053 \text{ cm}$
$12 \text{ m } 38 \text{ cm} = 1238 \text{ cm}$
Add the lengths:

$$834 \text{ cm} + 1053 \text{ cm} + 1238 \text{ cm} = 3125 \text{ cm}$$

Convert back to meters and centimeters: $3125 \text{ cm} = 31 \text{ m } 25 \text{ cm}$.
The total length of the pipe is $\boxed{\text{31 m 25 cm}}$.

Step 5: Solve .
Bola is 129cm tall and her brother is 58cm tall. To find the difference in their height, subtract the brother's height from Bola's height.

$$129 \text{ cm} - 58 \text{ cm} = 71 \text{ cm}$$

The difference in their height is $\boxed{\text{71 cm}}$.

Step 6: Solve .
A toilet pipe is 24m 26cm long. Lekan cuts off 12m. To find the remaining length, subtract the cut piece from the original length.

$$24 \text{ m } 26 \text{ cm} - 12 \text{ m}$$

Subtract the meters: $24 \text{ m} - 12 \text{ m} = 12 \text{ m}$
The centimeters remain the same: $26 \text{ cm}$
The length of the pipe now is $12 \text{ m } 26 \text{ cm}$.
The length of the pipe now is $\boxed{\text{12 m 26 cm}}$.

Step 7: Solve .
The lengths of the four sides of a quadrilateral are 30cm, 20cm, 30cm, and 20cm.