There would be 35 rulers.
In order to solve this, use cross multiplication.
6/10 = 21/x -----> cross multiply
10*21 = 6*x
210 = 6x
35 = x
Answer:

Step-by-step explanation:
Given


Required
Determine the difference
Represent this with d.
d is calculated using

The equation becomes

1. > = < = < >
2. 3/4
3. ? What do you mean by yes/no?
Answer:
<u>y = x - 1/5</u>
Step-by-step explanation:
x - y = 1/5
5x - 5y = 1
5y = 5x - 1
<u>y = x - 1/5</u>