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1.Five times the sum of twice a number and fiveis twenty-five. Find the number.

2. Sam is 45 years old, which is 20 less then 5 times Minnie's age. Which equation could be used to solve for Minnie's age. How old is Minnie? (Let Minnie's age be x)

2007-12-06 16:05:16 · 6 answers · asked by Anonymous in Science & Mathematics Mathematics

6 answers

1. 5(2x+5)=25
2x+5=5
2x=0
x=0


2. 45=5x-20
65=5x
x=13

2007-12-06 16:10:04 · answer #1 · answered by Amelia 6 · 0 0

1. 5(2x+5) = 25
10x + 25 = 25
10x = 0
x= 0

2. 45 = 5x - 20
65=5x
13=x

2007-12-06 16:10:10 · answer #2 · answered by li 4 · 0 0

Number one:
Assume the number is "x":
5 x (2x + 5) = 25
10x + 25 = 25
10x = 0
x = 0/10 = 0

Number two:
5x -20 = 45
5x = 65
x = 65 / 5 = 13

2007-12-06 16:16:36 · answer #3 · answered by rustabout 4 · 0 0

#1 is four
#2 (45-20)dividedby5=x
so minnie is five

2007-12-06 16:18:26 · answer #4 · answered by Jessica Z 2 · 0 0

n = smaller extensive form, x = greater extensive form. First, write the equations defined. the 1st equation may well be: n+x = 21 the 2d: 3n+2x=50 word: "sum" and "complete" point out addition. Then we resolve for one variable. you ought to unravel for any of the two variables and use any of the two equations, yet we could resolve for n and use the equation n+x = 21. n = 21-x Now we replace the fee of n, that's (21-x), into the different equation. So: 3n+2x=50 may well be 3(21-x) +2x = 50 next we resolve that equation, sixty 3- 3x +2x = 50, sixty 3-x = 50, -x = -thirteen so x = thirteen! Now replace thirteen for x into between the equations to unravel for n. n+x=21 with x = thirteen may well be, n+thirteen=21, n=8 the bigger extensive form EQUALS thirteen AND THE SMALLER extensive form EQUALS 8.

2016-10-10 10:57:48 · answer #5 · answered by ? 3 · 0 0

1. 5(2x + 5) = 25

2. 5x - 20 = 45

2007-12-06 16:16:18 · answer #6 · answered by Helmut 7 · 0 0

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