Question

2 QUESTIONS!

When a number is decreased by 10% of itself, the result is 27. What is the number?

Write an equation to model the problem. Use a to represent the number.
Answer:

Solve the equation to find the number:
Answer:

Answer 1

1. 30

2. 13 meters

Explanation:

Let the number be x.

x - (10% of x) = 27.

x - 0.1x = 27

0.9x = 27.

x = 27/0.9

x = 30

The number is 30

Second question:

Length = 2x - 3

Width = x

Perimeter = 72

Perimeter = 2(l + w)

= 2(2x - 3 + x) = 72

4x - 6 + 2x = 72

6x = 72 + 6

6x = 78

w = 78/6 = 13

The width is 13 meters