Percentages - high school - math problems

Number of problems found: 254

Mixed with percentages
Calculate 33 1/3% of 570.
Adding percentages
55%+36%+88%+71%+100=63% what is whole (X)? Percents can be added directly together if they are taken from the same whole, which means they have the same base amount. .. . You would add the two percentages to find the total amount.
Simple interest 3
Find the simple interest if 11928 USD at 2% for 10 weeks.
Percentage increase
Increase number 400 by 3.5%
Interest
What is the annual interest rate on your account if we put 32790 and after 176 days received 33939.2?
Car value
The car loses value 15% every year. Determine a time (in years) when the price will be halved.
Doctors
The drug successfully treats 90% of cases. Calculate the probability that he will cure at least 18 patients out of 20?
Component fail
There is a 90 percent chance that a particular type of component will perform adequately under high temperature conditions. If the device involved has four such components, determine the probability that the device is inoperable because exactly one of the
Events
Event P has probability of 0.84. What is the probability that the event P occurs in 3, 5, 7 try.
Radioactive material
A radioactive material loses 10% of its mass each year. What proportion will be left there after n=6 years?
What is
What is the annual percentage increase in the city when the population has tripled in 20 years?
Simple interest 2
Find the simple interest if 13905 USD at 4.5% for 6 months.
travel agency
Small travel agency offers 5 different tours at honeymoon. What is the probability that the bride and groom choose the same tour (they choose independently)?
A perineum
A perineum string is 10% shorter than its original string. The first string is 24, what is the 9th string or term?
Together m+w
Women 30%. Men are 360 more. How many are together?
Sum 10
What is the probability that two dice throw twice in a row will result the sum of 10?
Speedometer
The speedometer of a car reads 66 km/h. It's accurate to within 4.1% What is the maximum possible error?
Family
94 boys are born per 100 girls. Determine the probability that there are two boys in a randomly selected family with three children.
Three reds
What is the probability that when choosing 3 carats from seven carats, all 3 reds will be red?
Internet anywhere
In school, 60% of pupils have access to the internet at home. A group of 8 students is chosen at random. Find the probability that a) exactly 5 have access to the internet. b) At least 6 students have access to the internet