2010006207
Level:
B
If we increase an unknown number \(x\)
by \(8\, \%\), we
get \(432\).
Find \(x\).
\(400\)
\(466.56\)
\(397.44\)
\(380\)
B
2010006206
Level:
B
Find the number by \( 2.5{\small{{}^\text{o}\mkern-5mu/\mkern-3mu_\text{oo}}} \) greater than \( 800 \).
\(802\)
\(820\)
\(800.2\)
\(800.025\)
2010006205
Level:
B
The price of oil rose by \(60\%\). By how many percent it is necessary to reduce the price of oil so that it costs the same as before?
by \( 37.5\% \)
by \( 60\% \)
by \( 40\% \)
by \( 160\% \)
2010006204
Level:
B
The number of permanent residents of a city has decreased by \( 10\% \) per year in the last three years. How many residents did the city have three years ago, if we know that the last year the population was \(972\)?
\( 1\,200 \)
\( 1\,080 \)
\( 900 \)
\( 1\,070 \)
2010006203
Level:
B
Two sides of a rectangle were increased by \( 10\% \). What is the percentage change of the area of the rectangle?
it increased by \( 21\% \)
it increased by \( 20\% \)
it decreased by \( 40\% \)
it decreased by \( 20\% \)
2010006202
Level:
B
By how many percent should we shorten the edge of a cube so that its surface area is decreased by \( 19\% \)?
by \( 10\% \)
by \( 19\% \)
by \( 9\% \)
by \( 90\% \)
2010006201
Level:
B
If \( 40\% \) of the number \( 60 \) is by \( 18 \) smaller than \( 60\% \) of the number \( x \), then:
\( x=70 \)
\( x=20 \)
\( x=126 \)
\( x=193 \)
2010006107
Level:
B
The number \( 13^{12}+13^{13} \) is divisible by:
\( 7 \)
\( 8 \)
\( 6 \)
\( 4 \)
2010006106
Level:
B
The number \( 10^{2021}+8 \) is not divisible by:
\( 5 \)
\( 4 \)
\( 6 \)
\( 8 \)
2010006105
Level:
B
The number \( 432a623212 \) is divisible by \( 3 \) if
\( a= 8 \).
\( a= 7 \).
\( a= 4 \).
\( a= 0 \).