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lora16 [44]
3 years ago
7

The sum of two numbers is 108. the difference of the same numbers is 78. what are the numbers

Mathematics
1 answer:
Nimfa-mama [501]3 years ago
4 0

The sum of two numbers:

x + y = 108

The difference of the same two numbers:

x - y = 78

We can use substitution to figure out x and y:

x - y = 78 can be changed to x = 78 + y

We can plug this into the first equation:

78 + y + y = 108

78 + 2y = 108

2y = 30

y = 15

Now solve for x using any of the two equations. I'll use the first equation since it's easier:

x + 15 = 108

x = 93

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Let’s represent his sister’s sales as x

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3/4x

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The vendor of a coffee cart mixes coffee beans that cost $9 per pound with coffee beans that cost $5 per pound. How many pounds
lidiya [134]

Answer:

56.25 pound of the coffee that costs $5 per pound is needed

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Step-by-step explanation:

Let the number of pounds be x and y respectively

The total pounds is 75;

So;

x + y. = 75 •••••••(i)

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Total cost of second type;

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75 pound at $6 per pound; total cost of this is;

6 * 75 = $450

Thus;

9x + 5y = 450 ••••••••(ii)

From i, x = 75-y

Put this into ii

9(75-y) + 5y = 450

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4y = 675-450

4y = 225

y = 225/4

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x = 75-56.25

x = $18.75

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What's 89x50 equaled too
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Answer:

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