Answer:
54 cookies
Step-by-step explanation:
seven dozen means 7 * 12 cookies
because one dozen = 12 cookies, so having seven dozen means have seven, one dozen batches
seven dozen = 7*12 = 84 cookies
she already made 138
138 - 84 cookies = 54 cookies left to go
54 cookies
Answer:
I think it is 6/7
Step-by-step explanation:
I am really bad at explaining but I'm not completely sure
Answer:
588
Step-by-step explanation:
Formula for area of parallelogram is just base x height, so you do 28*21 and you get 588.
hope that helped :)
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:
3
Step-by-step explanation:
14 + n = 17
you have to isolate n by subtracting 14
n = 3