1003055504
Level:
A
If \( 12\% \) of the number \( a \) equals \( 15 \), then
\( a = 125 \).
\( a = 75 \).
\( a = 80 \).
\( a = 150 \).
Percent problems
1003055503
Level:
A
Tomek collected \( 320 \) coins in the piggy bank, including \( 112 \) one-zloty coins. What percentage of the coins in the piggy bank was the number of one-zloty coins?
\( 35\% \)
\( 45\% \)
\( 40\% \)
\( 50\% \)
1103055502
Level:
A
Titanic sailed to New York on April 10, 1912. Among the \( 2200 \) people on board there were Class I, Class II, Class III passengers and the crew. The pie chart shows the Titanic percent composition (to \(1\%\) accuracy). By what percentage is the number of the third-class passengers bigger than the number of the crew?
\(25\%\)
\(8\%\)
\(17\%\)
\(125\%\)
1003055501
Level:
A
The price of a certain commodity was reduced by \( 30\% \) and then by another \( 20\% \). It means that the price of the item was decreased by:
\( 44\% \)
\( 50\% \)
\( 60\% \)
\( 56\% \)
1003055412
Level:
A
There are \( 40 \) students in the class, including \( 18 \) girls. What percentage of students in this class are boys?
\( 55\% \)
\( 45\% \)
\( 65\% \)
\( 40\% \)
1003055411
Level:
A
An egg weighs \( 56 \) grams. \( 55\% \) of its weight is albumen, \( 40\% \) of the egg is yolk and the rest is the shell. The weight of the shell equals:
\( 2.8\,\mathrm{g} \)
\( 5.6\,\mathrm{g} \)
\( 5\,\mathrm{g} \)
\( 53.2\,\mathrm{g} \)
1003055410
Level:
A
Support for a political party X in March \( 2017 \) was \( 24\% \), and in September \( 2017 \) it was \( 30\% \). Party X noted an increase in support by:
\( 6 \) percentage points
\( 20 \) percentage points
\( 6\% \)
\( 20\% \)
1003055409
Level:
A
In Gdańsk, a kilogram of strawberries costs \( 4 \) zlotys and in Płock it costs \( 2.50 \) zlotys. The price of strawberries in Gdansk is higher than the price of strawberries in Płock by:
\( 60\% \)
\( 62.5\% \)
\( 37.5\% \)
\( 40\% \)
1003055408
Level:
A
How much pure gold contains a ring weighing \( 7 \) grams if the gold fineness is \( 750 \)? (That means, the gold content is \( 75 \) percent.)
\( 5.25\,\mathrm{g} \)
\( 5\,\mathrm{g} \)
\( 6\,\mathrm{g} \)
\( 5.5\,\mathrm{g} \)
1003055407
Level:
A
A \( 4\,\mathrm{kg} \) salt solution was prepared in the chemistry lab. The solution contains \( 250 \) g of salt. Calculate the percentage concentration of the solution.
\( 6.25\% \)
\( 6\% \)
\( 10\% \)
\( 25\% \)