Sold .40 * 300 = 120 cards with 180 remaining
.85 * 180 = 153 given to friends
Cards kept to herself = 300 - 120 -153 = 27
The formula is A=bh so b=20 and h=8
so 20*8=160
Twenty thousand there is a .05 annul growth percentage, throughout half of the time of 1960-2000 which is 40 years, 2000-2020 is twenty years which is half.
Answer:
Step-by-step explanation:
Let the number = x
So we are trying to work out what number must be subtract from the numerator and denominator of 5/3 to equal 5/7.
You can write this as:
Then you want to get rid of the fractions so multiply both sides by 3-x
Then multiply both sides by 7
Multiply it out.
35 - 7x = 15 - 5x
Add 7x to both sides:
35 = 15 - 5x + 7x
35 = 15 + 2x
Subtract 15 from both sides
35 - 15 = 2x
20 = 2x
To find x, divide both sides by 2.
x = 10.