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4 years ago

The sum of two numbers is 47. If there difference is 21, find the smaller number

Mathematics

1 answer:

NemiM [27]4 years ago

3 0

Answer:

13 , 35

Step-by-step explanation:

Let's call one of the number x and the other y

x + y = 47

x - y = 21 and x = 21 + y if we use this expression in the first equation instead of x we can find the value of y

x + y = 47 ➡ y + y + 21 = 47 add like terms

2y +21 = 47

2y = 47 - 21

2y = 26

y = 13 the value of first number is 13

x + y = 47 we know y is 13 so we can replace it

x + 13 = 47

x = 35

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4 years ago

David y Almudena tienen entre los dos 225 euros. Calcula cuánto dinero tiene cada uno si Almudena posee 75 euros más que David.

Misha Larkins [42]

David and Almudena have between the two 225 euros. Calculate how much money each has if Almudena has 75 euros more than David.

For this case we propose a system of equations:

x: Let the variable that represents Almudena's amount of money

y: Let the variable that represents David's amount of money

According to the statement we have:

$x + y = 225\\y + 75 = x$

Substituting the second equation into the first:

$y + 75 + y = 225\\2y + 75 = 225\\2y = 225-75\\2y = 150\\y = \frac {150} {2}\\y = 75$

We find the value of the variable x:

$x = 75 + 75 = 150$

Almudena has 150 euros

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Answer:

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4 years ago

Write your answer as a fraction or as a whole mixed number. 2 5/11 - 10 7/11

kaheart [24]

Answer:

-90/11

Step-by-step explanation:

convert each mixed number into a improper fraction

27/11 - 117/11

= -90/11

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3 years ago

Read 2 more answers

There are 4 empty seats and 76 occupied seats in a train. What percentage of the seats on the train are empty?

Norma-Jean [14]

Answer:

Step-by-step explanation:

fraction empty = empty / total

= 4/ (76+4)

= 4/80

=1/20

Changing to a percent

1/2 *5/5 = 5/100 = 5%

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3 years ago