115 +10p =305
Step-by-step explanation:
given,
let p day it takes
So,115+10p =305
Answer:
x = y/m - z/m +k
Step-by-step explanation:
1) Associative
2) Reversal
3) Addition
4) Commutative
5) Multiplicative Inverse
6) Additive Inverse
7) Reversal
8) Substitution
<u>RATE AS BRAINLIEST</u>
Answer:
There are 68 students in the class after these changes.
Step-by-step explanation:
g = number of girls
b = number of boys
Because the ratio of girls to boys is 3:1, initally the equation was
g = 3b
Finally, we have
g-1 girls because one girl dropped the class
b+3 boys because three more boys signed up
Because the new ratio of girls to boys is 5:2, the new equation is
(g - 1)/(b + 3) = 5/2
Cross multiply.
2(g - 1) = 5(b + 3)
2g - 2 = 5b + 15
2g - 5b = 17
Then, substitute g (which is 3b because the first equation was g = 3b)
2(3b) - 5b = 17
b = 17
g = 3b = 3*17 = 51
g = 51
The final number of students in the class = 17 + 51 = 68
Answer: 68
