Please help with these math riddles!!?

M

maya

New member
1.) One number is 10 times as large as another, and their difference is 81. Find the numbers.


2.)The length of a rectangle is 3 times the width, and the perimeter is Find the dimensions of the rectangle.

Width___ Length____


3.) The length of the base of an isosceles triangle is 4 inches less than the length of one of the two equal sides of the triangles. If the perimeter is 32, find the three sides of the triangle.
Place in order from smallest to largest numbers.

___, _____,____


4.) One number is five more than another and their sum is three less than three times the smaller. Find the numbers.

___, ____




Please answer any ones you what.
Also number 2 was suppose to say: The length of a rectangle is 3 times the width, and the perimeter is 22. Find the dimensions of the rectangle.
Oops, sorry. I meant answer any ones that you want.
 
You mean...."want"?

#4 Two numbers....a & b

*** One number is five more than another
=> a = b + 5

*** their sum is three less than three times the smaller
=> a + b = 3b - 3

NOTE.....'b' must be the smaller number because if a = b + 5, that infers that b is smaller. Make sense?

Now solve:

a = b + 5
a + b = 3b - 3

=> a = 3b - 3 - b
=> a = 2b - 3
=> (b + 5) = 2b - 3
=> b - 2b = -3 - 5
=> -b = -8
=> b = 8

Thus....'a' must be 13.



mmmkay?

:)

hth
 
4)

first number is x
second number is (x+5)

set-up:

3x - ( x + (x+5) ) = 3
solve for x
x = -2

smaller number = -2
larger number = 3
 
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