Children in Crossfire
Maths Challenge
2015
Quiz 5
Question 1
A male elephant weighs twice as much as a female elephant. The calf weighs one sixth of
the female’s weight. If the combined weight of the 3 elephants is 11.4 tonnes, what is the
weight of the adult female?
Question 2
One quarter of Africa is covered
by the Sahara Desert.
The approximate volume of sand
in the Sahara is 1,410,000 km3
and the area of the Sahara is
9,400,000 km2.
What is the average depth of the
sand?
Question 3
Use the following information to answer the question.
A is the number of countries that produce Uranium
B is the number of countries that produce Manganese
C is the number of countries that produce Gold
D is the number of countries that produce both Oil and Gas
E is the number of countries that produce Diamonds but not Manganese.
What is the value of
√(DE) X A(B + C) ÷ E
Question 4
Bayana and Dalia carry water home
from the well.
Bayana carries his 4 fifths full and Dalia
carries hers 3 fifths full.
Bayana carries 5 jugs home and Dalia
carries 3 jugs home.
A full jug holds 15 litres.
How much water do they carry home
together?
Question 5
This nile crocodile can swim at
a maximum speed of 30
km/hour. If he swims across a
river 400m wide at an average
speed of two thirds of his
maximum, how long will it take
him to cross the river?
Question 6
Jaha uses different coloured beads to make
necklaces and bracelets that she then sells in
the market.
She uses purple, red, green, black, white,
yellow, blue and orange beads to make one
of her bracelets
To make one necklace she begins by
choosing 50 purple beads and then increases
the number of each colour by (multiplying
by 2 and subtracting 30) each time. She does
this in the order the colours are written
above. How many orange beads will she use
to make this necklace?
Question 7
Malika works in the cornfield. She
has to check the corn every day to
make sure it is growing properly. It
takes her 2 hours to check 5 rows.
If she has to check 40 plants in each
row to the nearest ten plants, what
is the fewest number of plants she
must check in 12 hours?
If
Question 8
Below you can see a map of Africa. The map also shows part of Asia and Europe.
How many countries border Mauritania or Libya, but not Niger?