math
posted by sal .
A surveyor has a unit pace of 0.9 m/pace. (a) she counts 37 paces while walking From point C to point D. What is the distance between C to D? (b) how many paces should the same surveyor. count to lay out a line roughly 122m long?

1 pace = 0.9 m
37 paces = x
Cross multiply to get:
x=37*0.9/1=?
When you cross multiply, multiply the complete diagonal (the one occupied by two numbers, i.e. 0.9 and 37) and divide by the number diagonally across from x, i.e. 1.
Similarly,
1 pace = 0.9 m
y paces = 122 m.
Cross multiply to get the answer.