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topjm [15]
3 years ago
14

Three consecutive integers have a sum of 78. find the inte

Mathematics
2 answers:
VMariaS [17]3 years ago
5 0
Let the 3 numbers be x,x+1,x+2
Given sum of those 3 consecutive integers are 78
X+x+1+x+2=78
3x+3=78
3(x+1)=78
X+1=26
X=26-1
X=25

Therefore the numbers are 25,26,27
zalisa [80]3 years ago
3 0

Answer: 25, 26, and 27

Step-by-step explanation: Three consecutive integers can be represented as followed. Let's use "T" as our variable.

T → first integer

T + 1 → second integer

T + 2 → third integer

Since the sum of our three consecutive integers is 78, our equation will be as followed.

T + T + 1 + T + 2 = 78

We can simplify on the left.

3t + 3 = 78

     -3    -3   ← subtract 3 on both sides

     3t = 75

    ÷3    ÷3   ← divide by 3 on both sides

T = 25

T + 1 = 26

T + 2 = 27

Therefore, our three consecutive integers are 25, 26, and 27.

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Everyday, Dave eats either a sandwich or pizza for lunch. Over 42 days, Dave had pizza 3 times for every 4 times he had a sandwi
Elenna [48]

Remark

This problem drove 4 of us crazy until one of us made a break through.


Assumptions.

He must eat either 1 pizza a day or 1 sandwich a day. He can't eat 2 of anything during 1 day. So he can't eat 2 pizzas in a day or 2 sandwiches in a day.


Step One

Find the number of days in a cycle.

3 out of 4 days means out of 4 days he chooses Pizza

2 out of 3 days means out of 3 days he chooses a Sandwich.

That means that there are 4 + 3 days in total = 7 days in the cycle.


Step Two

Find the number of Pizzas and the number of Sandwiches he had during the 42 day period.


3/7 * 42 = Pizzas

3*6 = 18 pizzas in 42 days.


4/7* 42 = Sandwiches

4*6 = 24 sandwiches.


In 42 days he ate 24 + 18 = 42 lunches of either pizzas or sandwiches.


Step three This is the key step.

Find the ratio of sandwiches and pizzas for x days.


Every 5 days he either has 3 pizzas or 2 sandwiches. If the total number of days is x then

3/5 * x = Pizzas

2/5 * x = Sandwiches.


Step 4

Equate the results.

Pizzas = sandwiches.

18 + 3/5 x = 24 + 2/5 x Multiply by 5

18*5 + (3/5)*x * 5 = 24 * 5 + (2/5)*x*5

90 + 3x = 120 + 2x Subtract 2x from both sides

90 + 3x - 2x = 120

90 + x = 120 Subtract 90 from both sides.

x = 120 - 90

x = 30 days.


Conclusion

It takes 30 days to even up the number of pizzas with the number of sandwiches.




5 0
3 years ago
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