The right equations are a+c=30 (total number of people) and 8a+c=100 (total amount of money). So answers B and D cannot be right.
a+c=30 can be rewritten as c=30-a and filled into the second one:
8a + 30-a = 100 => 7a = 70 => a=10
That leaves answer A as the right one.
For a, we have 42in/9ft. Since 12 inches are in 1 foot, we can multiply it by that to get (42in/9ft)*(1ft/12inches) = 42/108. We put the foot on the top of 1ft/12in to cancel them out. Since 2 goes into both 42 and 108, we divide it by 2/2 to get 26/54. Repeating the process again, we get 13/27
If we were to say that there are 12 inches in a foot and therefore divide 42 by 12 (to get 42 inches in feet), we'd get the same answer due to that 1 foot is equal to 12 inches and if you were to divide it by 1 foot/12 inches, since they are the same thing, you get the same answer
For c, since it may be hard to get (42/12)/9, it could just be easier to have 42/(9*12)=42/108
2 x 13=26
1 x 26= 26
answer is 26
Answer:
Kayleigh will have a total of $4608.
Step-by-step explanation:
First, you use the formula, I=PRT (Interest=Principal, Rate, Time), then you distribute the numbers: (I=4500x0.8%x3) when you multiply them all, you get $108, then you lastly add 108 to 4500, and you get your final answer of $4608.
Answer: 4 1/5
Step-by-step explanation:
Rewriting our equation with parts separated
=2 + 3/5 + 1 + 3/5
Solving the whole number parts
2 + 1= 3
Solving the fraction parts
3/5 + 3/5 = 6/5
Simplifying the fraction part, 6/5,
6/5 = 1 1/5
Combining the whole and fraction parts
3 + 1+ 1/5 = 4 1/5
Solution by Formulas
converting mixed numbers to fractions, our initial equation becomes,
13/5 + 8/5
Applying the fractions formula for addition,
=(13 × 5) + (8 × 5)/5 × 5
=65+40 / 25
=105/25
Simplifying 105/25, the answer is
=4 1/5
