Let his total money be x.
He spent (3/7)*x of his money.
He gave 1/4(x-3/7x) to his sister.
which is : (1/4)*(4/7)*x = (1/7)*x
Now,
How much money he have in the beginning =
(3/7)*x+(1/7)*x+120=x
(4/7)*x+120=x
120=x-(4/7)*x
120=(3/7)*x
x=120*7/3 [cross multiplication]
x=280.
So, Alex had $280 in the beginning.
Answer:
32.55
Step-by-step explanation:
Answer:
Store 1 has the better deal.
Explanation:
If you divide the amount the prices by the amount of paper towel roll, you would see store 1 has the better deal.
3.60 divided by 12 = 0.30
3.50 divided by 10 = 0.35
As you can see, store 1 is less expensive than store 2. Therefore, store 1 is the better deal.
It is not a true biconditional.
Answer:
-1/2 ≤ x ≤ 3
Step-by-step explanation:
hope that helps
