2 years ago

The variables x and y are directly proportional, and y=4 when x=3 . What is the value of y when x=15 ?

Mathematics

1 answer:

bulgar [2K]2 years ago

7 0

Y= 20
3 X 5 = 15
4 X 5 = 20

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18 is ( blank ) % of 30

meriva

Make an equation.

'is' is an equal sign

The blank can be 'x'

'of' = multiplication

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Multiply:

18 = 30x

Divide 30 to both sides:

x = 0.6

Multiply by 100:

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3 years ago

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2 years ago

In a certain year, the average e-mail user sent or received 111 e-mails each day. The number of e-mails received was 3 more than

Ludmilka [50]

Answer:

Number of sent mail = 36

Number of received mail = 75

Step-by-step explanation:

Let,

x be the number of mails sent

y be the number of mails received

According to given statement;

x + y = 111 Eqn 1

y = 2x + 3 Eqn 2

Putting value of y from Eqn 2 in Eqn 1

x + 2x + 3 = 111

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Dividing both sides by 3

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Putting x = 36 in Eqn 2

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Hence,

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Number of received mail = 75

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2 years ago