Answer:
The age of triplets is 42 years old
Step-by-step explanation:
The question in English is
The sum of the ages of twins and triplets is 150 years if the ages are exchanged the new sum is 120 years. What is the age of triplets?
Let
x -----> twins age
y ----> triplets age
we know that
2x+3y=150 ------> equation A
2y+3x=120 -----> equation B
Solve the system by graphing
The intersection point both graphs is the solution of the system
The solution is the point (12,42)
see the attached figure
therefore
The age of triplets is 42 years old
Answer:
$260
Step-by-step explanation:
20% is equal to decimal form 0.2 or fraction form 1/5
1/5 of 800 = 1/5 * 800 = 160
He earns 100$ everyday even if he made sales worth $0.
100 + 160 = 260
Well , i took a while to understand the question , lol . I guess the answer is. 7 students
Answer:
56 mins
Step-by-step explanation:
Number of gallons of water in the pool per minute;
750 divided by 35 = 150/7
Let the time needed to fill a 1,200 gallon pool be t.
t x 150/7 = 1,200
t x 21.42857142857143... = 1,200
t = 1,200/21.42857142857143
t = 56 mins
Answer:
18 hours
Step-by-step explanation:
There are 24 hours in a day and we have 5 weekdays per week.
15% of 24 hours
15/100×24
0.15×24
=3.6 hours
Mrs Miller spends 3.6 hours of each weekday traveling in her car.
There are 5 weekdays in a week to include: Monday, Tuesday, Wednesday, Thursday and Friday.
If she spends 3.6 hours per weekday
Then,
During the week, she will spend
3.6 hours× 5 weekdays
=18 hours
She will spend 18 hours per week traveling in her car.
