Sarah is twice as old as her youngest brother if the difference between their ages is 15 years how old is her youngest brother

Answers

Answer 1

Answer: He is 15 years old.
You would set up a system of equations
S = Sarah
Y = Youngest brother

S = 2Y
S-Y= 15

Substitute 2Y for S
So 2Y-Y= 15
Y= 15
and that's your answer :-)

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When you add 18 to 1/4 of a number you get the number itself

Answers

-- Then when you only have 1/4 of the number, 18 must be
the missing 3/4 of it.

-- If 18 is 3/4 of it, then each quarter of it is 6 .

-- When you have all 4 quarters in the same place, if each one is 6,
then the whole thing must be 24.

What is 90 out of 95 written as a fraction?

Answers

$90\ out\ of\ 95 = (90)/(95)\ which\ simplifies\ to\ (18)/(19)$

90/95 or it can also be written as 90 over 95

What percent of $257.00 is $12.85? Round answer to the nearest tenth of a percent.

Answers

If you would like to know what percent of $257.00 is $12.85, you can calculate this using the following steps:

x% of $257.00 is $12.85
x% * 257.00 = 12.85
x/100 * 257.00 = 12.85
x = 12.85 * 100 / 257.00
x = 5%

Result: 5% of $257.00 is $12.85.

Leena consumes 400 calories at breakfast and 350 calories at lunch. She consumes of her daily calories at dinner. If x represents the calories consumed at dinner, which statements describe the situation? Check all that apply.a. Leena consumed 1,500 calories at dinner.
b. The equation 2/3(x + 400 + 350) = x can be used to model the situation.
c. Leena consumed 500 calories at dinner.
d. The equation 2/3(x) = x(400 + 300) can be used to model the situation.
e. Leena consumed 1,000 calories at dinner.
f. The equation 2/3x(400 + 300) = x can be used to model the situation.

Answers

Only Option 'A' and 'B' are correct.

a) Leena consumed 1,500 calories at dinner.

b) The equation 2/3(x + 400 + 350) = x can be used to model the situation.

What is an expression?

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

Since, we have given that

Number of calories she consumed at breakfast = 400

Number of calories she consumed at lunch = 350

Now, Let number of calories she consumed at dinner be x

According to question,

She consumes 2/3 of her daily calories at dinner,

So, it becomes,

1/3 x total = 400 + 350

total = 2250

so, Number of calories she consumed at dinner is given by

2/3 of total = x

2/3 x 2250 = x