Direct relationship + percentages - math problems

Number of problems found: 25

Pupils
There are 32 pupils in the classroom, and girls are two-thirds more than boys. a) How many percents are more girls than boys? Round the result to a whole percentage. b) How many boys are in the class? c) Find the ratio of boys and girls in the class. Writ
Image reduction
To say that I am mathematically challenged is a gross understatement! I'm trying to help my friend determine how to calculate percentages of reduction or enlargement for a quilt pattern. She is creating a drawing of a cute picture that will become a piece
Nectar
Nectar collected by bees contains 70% water. From the nectar of the some process produces honey which contains 19% water. How many kg of nectar bees need to collect to make 1 kg of honey?
Bath salts
Bath salt A weighs 900 grams and costs 36,40 CZK. Bath salt B weighs 1000 grams but costs 85 CZK. How much is a bath salt A cheaper than B salt?
Copy typist
Typist for 12 hours rewritten 15% of the manuscript. After how many hours he will done 35% of the manuscript?
Sisters
Sisters Zuzka Lenka and Vierka has save for a new bike. Zuzka save € 90, Lenka save € 90 and Vierka save € 82. Missing 30% gave them their mother. What is the price of the bike?
Product V2
The price of product was increased by 12%. Price increased by 273. How much money it would cost this product, if it was on the contrary by 19% discounted.
Sales vs profit
Apple sells 22 percent less computes than Acer, but its sales are 2.2 times higher than Acer. How many times are Apple computers more expensive than Acer?
Simple interest 4
Find the simple interest if $x USD at $p% for $m days. Assume a $r-day year.
Simple interest 2
Find the simple interest if $x USD at $p% for $m months.
Simple interest 3
Find the simple interest if $x USD at $p% for $m weeks.
Accidents
The count of accidents in 1995 caused 8780 women which is 8.4%. How many men caused the accidents?
Saving
Allen save € 2860 to buy a car. Yet it lacks save 55% of the car price. How much is the car?
Square
If we increase side of the square, increase its area of 63%. What is the percentage we increase side of the square?
Negative percentage
In 2006, the company had a loss of 11100 Euros. Two years later, he was already in profit 50000 Eur. Calculate what percentage of the company increased profits in these two years.
Bonus
The gross wage was 1323 USD including 25% bonus. How many USD were bonuses?
TV fail
The TV has after 10,000 hours average 35 failures. Determine the probability of TV failure after 400 hours of operation.
Server
Calculate how many average minutes a year is a webserver is unavailable, the availability is 99.99%.
Blood
In the human body, the blood is about 7.3% body weight. How many kilograms of blood are in the human body with weight 109 kg?
Fixed expenses 2013
Since 2013, the Slovak government plans to tax more small one person businesses. Instead of fixed expences 40% will be fixed expences 40% of gross income up to 420 Eur. Calculate what percentage of fixed expences will in 2013 pays from gross income 1569 E