Answer:
Sister = 15 years old
Brother = 12 years old
Step-by-step explanation:
Right now, if the brother is B years old and the sister is S years old, B = (4/5)S because the ratio from brother to sister is 4:5, so if one unit is X, B = 4X and S = 5X
Three years ago, the brother was B-3 years old and the sister was S-3 years old. Keeping one unit as X, we have
B = 3X
S = 4X
B-3 = (3/4)(S-3)
Therefore, we have a system of equations
B = (4/5)S
B-3 = (3/4)(S-3)
Substitute (4/5)S for B into the second equation to only have one variable
(4/5)S - 3 = (3/4)(S-3)
(4/5)S - 3 = (3/4)S - 9/4
add 3 to both sides and subtract (3/4)S from both sides to isolate the variable and its coefficient
(1/20)S = 3/4
multiply both sides by 20 to isolate the S
S = 15
B = (4/5)S = 12
Multiply .03 by 42
.03×42=1.26
1.26kg + 42kg= 43.26
Answer: 43.26kg
uhm 1+1 is 2 or 213456534578342758790893247234030825793406867452089 im not sure
Hello!
<u><em>Answer: =14.858</em></u>
Explanation:
Multiply by the numbers. Product it can also multiply by the numbers, fractions, decimals, factors, and multiples.
3.4 it has one decimal place.
4.37 it has two decimal place.
So, the answer it should be have a three decimal places.
Hope this helps!
Thanks :)
-Charlie
Answer:
A and C
Step-by-step explanation:
