19. There are 64 children in 6th grade. There are 20 more girls than boys Answer the following questions: A. How many girls are in 6th grade?
B. What is the
ratio of boys to girls?
C. What is the ratio of boys to total/6th grade students?
D. After winter break, 3 boys moved to another town and left the 6th grade class. Then 2 new girls joined
the 6th grade. What is the ratio of boys to total students now?

i'm not really sure how to answer that

step-by-step explanation:

hello!

to begin with, we're given that on earth, a rock weighs 20 pounds, and while on jupiter, that same rock weighs 42 pounds. now, we're trying to find the weight of a rock that weighs 10.5 pounds on earth, on jupiter.

to solve this, first, set up a proportion, cross-multiply, and solve it algebraically.

setting up the proportion is the hardest and the most confusing part of the problem, but it's simple.

if on earth, the rock weighs 20 lbs, and on jupiter it weighs 42 lbs, our first part of our proportion is 20/42 lbs. the second part has to be equal to each other. this means that 10.5 has to be on the numerator of the fraction, and x, the value we're trying to find, has to be on the denominator. remember that the rock weighs 10.5 lbs on earth, and we're trying to find the weight of it on jupiter (which is x).

20/42 = 10.5/x

next, you would cross-multiply.

20x = 42(10.5)

20x = 441

now, solve it algebraically by using division.

x = 22.05 lbs

this can be rounded to 22.1 lbs.

therefore, the weight of the rock on jupiter is 22.1 lbs, the fourth choice.

answer: i ! the answer is   9000 seconds, also d

hope i

-lavira : )