Okay, so the rate is 1 job / hours, so:
1/3 + 1/7 (This covers both their work rates) = 1/n (n represents the time it take for them to work together)
Get the LCD:
7/21+ 3/21 = 1/n
10/21 = 1/n
Cross multiply:
10n = 21
n = 2.1
It will take them 2.1 hours, or 2 hours and 6 minutes
Number of books = 42 / 5/8 (Note 3 1/2 feet = 42 ins.)
= 42 * 8/5 = 336 / 5 = 67.2
67 books will fit on the shelf.
3x+25=90
-25=-25
3x=65
x=26.6666666666666666666666
I hope this helps!
Answer:
1. Tall Dog
2. Small Dog
3. Regular Dog
4. Fat Dog
Step-by-step explanation:
It's simple. Look at the problem ;)
