how can do these word problems?

Question

when the danes multiplied their secret number by 3 and then add -7 the result was 72 less than twice the opposite of the number.what was the seret number of the danes?

only seven sixteenths of the warriors necessary to defend the castle answered the call to arms.if 420 answered the call how many were required to defend the castle?

the defenders thought of consecutive odd integers while waiting for the fusillade from the trebuchet.their integers were three in number and were such that 5 times the sum of the first and third was 108 greater than twice the opposite of the second what were the integers?

eighty-six is 20 percent of what number?

what number is 340 percent of 56?

Answer 1

(s*3 - 7) = 2*(-s) - 72
3s - 7 = -2s - 72
5s = -65, s = -13

7/16*w = 420, w = 420*16/7 = 60*16 = 960

numbers are n - 2, n, n + 2:
5*(n - 2 + n + 2) = 108 + 2*(-n)
10n = 108 - 2n, 12n = 108, n = 9, so 7, 9, 11 are the numbers

86 = N*20/100 = .2*N, 5*86 = 5*(.2N), 430 = N

56*340/100

Answer 2

Sir:
You asked five questions.
1.) Not sure what you mean by "opposite of the number"

2.) 7/16X = 420 so 1/16X = 60 and X = 16(60) = 960

3.) ?

4.) 86 = 0.20X so 86 / 0.20 = X and X = 430

5.) 56( 340 / 100 ) = X
56 ( 3.4 ) = X
X = 190.4

Regards (sorry about the unanswered ones)
Zah

Answer 3

1. What do you mean by opposite?

2. (7/16)x =420
x = 420*16/7 = 960

3. See #1

4. 86 = .2x
x = 86/.2 = 86*5 = 430

5. 3.4 * 56 = 190.4

Answer 4

particular you could label the variable x as width and length could be x + 12 make an equation 2x + 2(x+12) = 156 on account which you upload all facets to get perimeter then u resolve for x yielding the respond x = 33 = width x + 12 = 40 5 = length

Answer 5

To much thought.