9000080910
Level:
B
Find the set difference \(A\setminus B\)
for \(A = \{x\in \mathbb{Z};\left |x\right | < 3\}\)
and \(B = \{x\in \mathbb{N};x < 5\}\).
\(\{ - 2;-1;0\}\)
\(\emptyset \)
\(\{- 2;-1\}\)
\(\{3;4\}\)
B
9000085303
Level:
B
The shop received \(30\)
pieces of TV from the manufacturer NoName. Five TVs in this delivery
were defect. The shop also received TVs from the manufacturer
GoodName. All these TVs were perfect. The final inspection revealed that
\(10\, \%\) of
TVs were defect in total. Use these information to find out how many TVs have been
supplied from the producer GoodName.
\(20\)
\(25\)
\(18\)
\(16\)
9000085304
Level:
B
The final score of the hockey match between teams
\(A\) and
\(B\) was
\(2 : 2\). The goaltender
of \(A\) had
success rate \(90\, \%\)
(he stopped \(90\, \%\)
of all shots on goal) and the goaltender of the team
\(B\) had fail
rate \(20\, \%\)
(\(20\, \%\) of all
shots on goal went into his net). How many shots on goal has been in the match in
total?
\(30\)
\(25\)
\(35\)
\(40\)
9000085307
Level:
B
A machine fills \(2\: 000\)
bottles per hour. As a consequence of technical problems, the efficiency of the machine
decreased by \(10\, \%\).
How many bottles can be filled by the machine with the mentioned technical problems during a
time period of \(8\)
hours?
\(14\: 400\)
\(13\: 800\)
\(14\: 500\)
\(15\: 200\)
9000078907
Level:
B
The unknown number \(x\)
has been increased by \(20\, \%\)
and then decreased by \(5\, \%\).
The final value was \(513\).
Find \(x\).
(Round to the closest integer.)
\(450\)
\(446\)
\(430\)
\(436\)
9000078901
Level:
B
If we increase an unknown number \(x\)
by \(5\, \%\), we
get \(378\).
Find \(x\).
\(360\)
\(359.1\)
\(396.9\)
\(350\)
9000078908
Level:
B
A house price in the March was \(\$259\: 000\).
The house has not been sold for several months and the price dropped to
\(\$234\: 000\) in
August. Write the discount as percents of the original price. (Round to the tenth.)
\(9.7\, \%\)
\(10.7\, \%\)
\(10.5\, \%\)
\(9.5\, \%\)
9000078910
Level:
B
There is \(19\)
girls and \(12\)
boys in the class. Find the difference between the percentage of the girls and boys in
this class.
\(22.6\, \%\)
\(15.1\, \%\)
\(18.5\, \%\)
\(23.5\, \%\)
9000080901
Level:
B
Find the intersection \(A \cap B\)
for \(A = \{ - 5;0;1.5;2;6\}\)
and \(B = \{x\in \mathbb{Z};x\geq 0\}\).
\(\{0;2;6\}\)
\(\{0;1.5;2;6\}\)
\(\{1.5;2;6\}\)
\(\mathbb{Z}\)
9000080903
Level:
B
Find the union \(A\cup B\)
for \(A = \{x\in \mathbb{Z};x\geq - 3\}\)
and \(B = \{x\in \mathbb{N};x < 8\}\).
\(\{x\in \mathbb{Z};x\geq - 3\}\)
\(\{1;2;3;4;5;6;7\}\)
\(\{ - 3;-2;-1;0;1;2;3;4;5;6;7\}\)
\(\mathbb{Z}\)