Answer:
Angelina should buy 9 packs of pens and 8 packs of pencils.
Step-by-step explanation:
Each pack of pens = 8 pens
Each pack of pencils = 9 pencils.
Also we know that, Commutative Property of Multiplication states that
a x b = b x a for any two numbers a and b.
So, 8 x 9 = 72 = 9 x 8
Hence, she should buy 9 packs of pens, so she will have 9 x 8 = 72 pens.
And she should buy 8 packs of pencils, she will have 8 x 9 = 72 pencils.
Let the number of girls be g.
Let the number of boys be b.
Now we can write these equations;
3g + 4b = 92 ..........(1)
g + b = 26 ...............(2)
b = 26 - g ................(3)
Plugging the expression for b in (3) into (1), we get:
3g + 104 - 4g = 92 ......(4)
Solving (4) we get
g = 12
So the number of girls in the class is 12.
The first year it decreased by 20%. Multiply the cost of the car by 80% ( 100%-20% = 80%)
24,000 x 0.8 = 19200
After the first year the car was valued at €19,200
Now divide the value after the 2nd year by the value after the first year:
16128 / 1900 = 0.84 * 100 = 84%
The car is 84% of the value.
100 - 84 = 16
The cars value decreased by 16% during the second year.
Your straight line is east-west