Answer:
<em>Zeina had 35 books and Ali had 5 books</em>
Step-by-step explanation:
<u>Equations</u>
We know Zeina has seven times as many books as Ali. If we call
x = Number of books Ali has
Then Zeina has
7x = Number of books Zeina has
We also know if Zeina gave Ali 15 books, they would have the same number of books, thus:
x + 15 = 7x - 15
Adding 15:
x + 15 +15 = 7x
Subtracting x:
15 +15 = 7x - x
Operating:
30 = 6x
Dividing by 6:
x = 30 / 6
x =5
7x = 35
Thus Zeina had 35 books and Ali had 5 books
Your answer is: y=5
Here are the steps:
<span>4=2/9(4y-2)
=2/9(4y-2)=4
=9*</span>2/9(4y-2)=4*9
=2(4y-2)=36
=2(4y-2)/2=36/2
=4y-2=18
=4y-2+2=18+2
=4y=20
=4y/4=20/4
=y=5
Answer:
length is 40 and breadth is 20
Step-by-step explanation:
120 =2( l + b )
120 = 2( 2x +x )
120= 2 x 3x
120 =6x
120/6 = x
20 = x
length=2x = 2 x 20 = 40
breadth= x = 20.
hope it helps u
Answer:
The answer for this problem would be 50.
Step-by-step explanation:
If you calculate 90% of 50, you should get 45 so, the answer is 50.
Answer:
20 miles per hour
Step-by-step explanation:
Given that the train left for London, and after 9 hours later, a car traveling 80 miles per hour tried catching up to the train. After 3 hours, the car caught up
Which means that the car travelled the same distance in 3 hours as the train travelled in 9 + 3 = 12 hours
Let the distance be d
Given the speed of car is 80 miles per hour
We know that 
d = 240 miles
Now for the train Average speed = total distance / total time taken
Average speed of the train = 
= 20 miles per hour
