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Mr. Tanabe stood on the middle rung of his ladder to wash windows of an office building. He stepped up 3 rungs to reach more of the windows. Then he saw a spot he had missed on one of the windows below, so he climbed down 5 rungs. After he cleaned that spot, he climbed up 7 rungs and washed the rest of the windows. After he finished, he climbed the remaining 6 rungs to the top of the building to pick up all his equipment.

 

How many rungs did the ladder have?

Optional: Our teacher told us to write our answer in R.A.C.E form but I am confused of how to do so. If you can help me with that too, it will be great, if not its alright. Here is a link to my assignment if you want to take a closer look at it: https://docs.google.com/drawings/d/1qbMri8Pi_CqGsozbZJjpPhBeVf3R3RGVnlarDFniEX4/edit?usp=sharing

Answer 1

he starts at the middle rung. Now try to figure out how many rungs were from there to the top. Multiply that by two to get the number of rungs in the ladder

up 3 down 5 up 7 up 6 more

3-5+7+6 = 11 rungs

2 x 11 = 22 rungs on the ladder