Question

i need the formula for this word problem....a train travels 20 feet in 1/5 second. at this same speed, how many feet will it travel in three seconds.

Answer 1

Its speed is \(\frac{20}{1/5}=100 ft/s\). So in three seconds, it will travel \(100(3)=300 ft\).

Answer 2

thank you

Answer 3

You're welcome!

Answer 4

i have another one please

Answer 5

Ask away!

Answer 6

in printing an article of 48,000 words, a printer decides to use two sizes of type. using the larger type, a printed page contains 1800 words. using the smaller type, a page contains 2400 words. the article is allotted 21 full pages in a magazine. how many pages must be in smaller type? please give me the formula

Answer 7

All right. You can use the givens in the problem to write two equations and then solve them to get the number of each type. Let x be the number of the smaller type and y the number of the bigger one. We know that the total number of pages should be 21. So, \(x+y=21\) .... (1)
That was the first equation. The second equation can be found by considering the total number of words.
\(1800y+2400x=48000\) ... (2)

Answer 8

Solve the two equations. the value of x is the number of pages in smaller type, and that's your answer.

Answer 9

You will find that the number of the smaller pages x=17 pages.

Answer 10

i have forgotten how to solve my x and y...please help it has been a long time for me

Answer 11

From equation (1), we have \(y=21-x\). Substitute that in (2) and get x. \(1800(21-x)+2400x=48000 \implies 37800+600x=48000\)
\(\implies 600x=10,200 \implies x=17\).

Answer 12

got it thank you so much