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sveta [45]
3 years ago
10

One number is 3 less than twice another. If their sum is 39 find the numbers

Mathematics
1 answer:
DedPeter [7]3 years ago
5 0

Answer:

The numbers are 14 and 25

Step-by-step explanation:

Let one of the numbers be x. The second number we are told is 3 less than twice x. The second number will thus be;

2x - 3

The sum of the numbers is thus;

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

But the sum of the numbers is said to be 39, therefore;

3x - 3 = 39

3x = 42

x = 14

The second number is thus;

2(14) - 3 = 28 - 3 = 25

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Licemer1 [7]
We need to write system of equations for this problem. Reading text we write 1 equation by 1.
first lets name our variables
x - Kiana cards
y - Gary cards
z - Monty cards
m - Willa cards

x = y-3         which we can write as y = x+3
z = x + 7
m = 2z
x + y + z + m = 74

I think easiest way to solve this is to express all variables in last equation and solve for x.
x + x+3 + x + 7+ 2x + 14= 74
5x = 50
x = 10
now we just calculate cards given to each friend

y = 13
z = 17
m = 34
7 0
3 years ago
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Anestetic [448]

Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 0
3 years ago
Find the percent of increase from 80$ to 90$
Ivan

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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