If Peter spends 20% of his salary on expenses, and his salary is $30,000, then all we need to do is find 20% of 30,000.
We can do this by converting 20% to a fraction or decimal. We'll do fraction because I think it is easier to see.
20% = 20/100 = 2/10 = 1/5
So we need to find 1/5th of 30,000
1/5 x 30,000 = 30,000/5 = 6,000
Therefore, Peter has $6,000 to spend on expenses.
Letter a is equal too -1300
and letter b =-32
hope this helps
Answer:
10%
Step-by-step explanation:
a simple way to put it is 50 * 2 is 100, 5 * 2 is 10, so 10/100 is 10%
Answer: 65 grams
Step-by-step explanation:
If 130 grams of a gold alloy (a mixture of gold and one or more other metals) containing 85% pure gold, you should first calculate the amount of gold that makes up this percentage.
That is, 85% of 130 grams.
85/100 × 130 = 110.5
Then, let X be what will be added to the above value to make 90%. So,
(110.5 + X) / ( 130 + X ) × 100 = 90
Divide both sides by 100
(110.5 + X) / ( 130 + X ) = 90/100
(110.5 + X) / ( 130 + X ) = 0.9
Cross multiply and open the bracket
110.5 + X = 117 + 0.9X
Collect the like terms
X - 0.9X = 117 - 110.5
0.1X = 6.5
Divide both sides by 0.1
X = 6.5/0.1
X = 65 grams
Therefore, the amount of pure gold that should be added is 65 grams
Answer:
r = 11 cm
Step-by-step explanation:
The radius is 1/2 of the diameter
r = d/2
r = 22cm /2
r = 11 cm
