Write an equation for each of the relationships that are des

Write an equation for each of the relationships that are described below. Then solve the equation for the unknown. (Do not forget to start by defining a variable to represnt the unknown value.)

A. 17.5 is equal to 2 times some number. What is the number?

B. The sum of 3 times some number and 12 is 42. What is the number?

C. 1/4 of some number is 4.3. What is the number?

D. Some number is 4 times as large as 9.8. What is the number?

E. Some number is equal to 1/3 of the sum of 88.2, 93.5, and 64. What is the number?

F. The change from some number to 12.5 is -5. What is the number?

G. Measuring some number in units of 12 is 3.5. What is the number?

Solution

a) Let\'s say no as x => 17.5=2x => x = 17.5/2
                                 => x = 8.75

b) Let\'s say no as y , it means 3y+12=42
                                      3y = 30
                                      y = 10
c) Let\'s say no as x => x/4 = 4.3
                         x=17.2
d) Let\'s say no as x => 4x = 9.8
                        x = 9.8/4 => x=2.45