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nadya68 [22]
2 years ago
10

John’s father is 5 times older than John and John is twice as old as his sister Alice. In two years time, the sum of their ages

will be 58. How old is John
Mathematics
1 answer:
oksano4ka [1.4K]2 years ago
7 0

Answer:

8 years

Step-by-step explanation:

Let age of father be f

age of John be j

age of Alice be a

John's father is 5 times as old as John. We can write:

f = 5j

John is twice as old as Alice. We can write:

j = 2a

or

a = j/2

SUM OF ALL OF THEIR AGES (after 2 years) will be 58. We can write:

f+2 + j+2 + a+2 = 58

This becomes:

f + j + a + 6 = 58

f + j + a = 52

Now, we replace third equation with the first two (in bold) and get:

f + j + a = 52\\5j + j + \frac{1}{2}j=52\\6.5j=52\\j=8

So John is 8 years old

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A submarine patrolling the Indian Ocean was situated 800 feet below sea level. If it ascends 275 feet, what is its new position
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Answer:

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Step-by-step explanation:

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to ascend means to rise, so the submarine would be moving +275 feet (going higher, closer to sea level)

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myrzilka [38]

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then by adding this pattern of vowels you get:

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7 0
2 years ago
Convert 8 miles into feet and then into inches.
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Answer:

5,280 * 8 = 42,240

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Step-by-step explanation:

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