During a certain 7-year period, the consumer price index (CPI) increased by 60%, but during the next 7-year period, it increased by only 50%. Which of
these conditions must have existed during the second 7-year period?
A. Stagnation
B. Inflation
C. Deflation
D. Conflation

5 feet & 15 feet

Step-by-step explanation:

The question is to find the lengths of 2 sides of the rectangle.

Solution:

Let shorter side be "x"

Let longer side be "y"

From the question, we can write:

y = 3x

also

y - x = 10

Now, putting the first on second equation, we get:

y - x = 10

3x - x = 10

2x = 10

x = 10/2 = 5

Now, y = 3x, y = 3(5) = 15

So we can say the lengths of 2 sides of the rectangle is 5 feet & 15 feet