Question

The sum of four lengths is 4.36m. If three of the lengths are 1½m, 25cm and 2.10m, what is the fourth length in metres?

Answer 1

First, let's convert all the lengths to meters so that they are in the same unit:

1½m = 1.5m
25cm = 0.25m
2.10m = 2.10m

Now, we can add up all the lengths to find the sum:

1.5m + 0.25m + 2.10m + x = 4.36m

Combine the known lengths:

3.85m + x = 4.36m

Now, solve for x by subtracting the sum of the known lengths from both sides:

x = 4.36m - 3.85m

x = 0.51m

Therefore, the fourth length is 0.51 meters.