Answer:
The cost should be (925 + 145) x 12 + 500 = 13340$
The grandmother is 63 and the grandson is 15.
You must find numbers that multiply up to 945:
Ex:
45*21=495
135*7=495
63*15=495
Answer:
800 mL
Step-by-step explanation:
Let b represent the amount of solution B added to 2400 mL of solution A. The total amount of alcohol (mL) in the mixture is ...
10%×2400 + 50%×b = 20%×(2400 +b)
multiplying by 100 to get rid of the % signs and simplifying, we have ...
24000 +50b = 48000 +20b
30b = 24000 . . . . . . . . . subtract 24000+20b
b = 800 . . . . . . . . . . . . . . divide by 30
Debra added 800 mL of 50% alcohol to her 2400 mL of 10% alcohol to make a 20% solution.
Answer:
$1.40
Step-by-step explanation:
Find 4% of $35.
4% of $35 = 0.04 × $35 = $1.40