Answer:
<em>Total cost=$73.60
</em>
Step-by-step explanation:
<u>Arithmetics To Solve Simple Problems
</u>
Sometimes the use of the most basic operations can be handy to solve problems of a variety of complexities without the use of equations or algebra. We'll approach to the solution of this question by pure logic and basic operations.
If the gift was originally meant to be paid for all 5 brothers, each one would have paid one-fifth of the cost. But since the younger brother won't be paying anything, the cost will be divided among the other four brothers, each one of which will pay now one-fourth of the cost. But this new division is $3.68 more than the previous one. If we take the difference between both fractions, we get
That fraction is the portion of the money they are paying in excess, so the total cost should be twenty times that excess, i.e.
Total cost= 20*3.68=$73.60
Let's check. Each brother should have paid $73.60/5=$14,72. But the four brothers really paid $73.6/4=$18.40. The difference is cost is $18.40-$14,72=$3.68 as required
Answer:
4u+44
Step-by-step explanation:
The number 4 on the outside of the parentheses is being multiplied by everything within the parentheses, resulting in a product of 4u+44
Answer:
-4
Step-by-step explanation:
I got it wrong and it showed me the answer.
Answer:
About 5,000 kilograms
Step-by-step explanation:
Look on the x-axis for 18 years. Then go up to where the plotted line is on 18 years to find the y-axis or the mass.
Answer: The radius of the ball must be 5.4 cm
Step-by-step explanation:
The information we have is:
Density of the material = 1.5 g/cm^3
Shell mass = 10 g
we want to find the radius of the ball, such when it is full, the mass is 1 kg.
The mass of the sphere is equal to the density of the material times the volume of the sphere.
The volume of the sphere is:
V = (4/3)*pi*r^3
where pi = 3.14 and r is the radius.
The mass of a filled ball is the mass of the filling material plus the mass of the shell, we have:
mass of the full ball = 1kg = 1000g = (1.5g/cm^3)*((4/3)*pi*r^3) + 10g
1000g = (6.28g/cm^3)*r^3 + 10g
so we must find the value of r.
1000g - 10g = (6.28g/cm^3)*r^3
990g/(6.28g/cm^3) = r^3
157.64cm^3 = r^3
![r = \sqrt[3]{157.64cm^3} = 5.4 cm](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%5B3%5D%7B157.64cm%5E3%7D%20%3D%205.4%20cm)
