Can anyone tell me why i’m not getting full marks (3/4) marks.

£59.25

Step-by-step explanation:

i will put my full working then you will be able to spot where you went wrong

formula :

1/2 * ( sumof parallel sides ) * height

= 1/2 * (12 +20 )* h

since height is not given we need to use Pythagoras theorem

right angle triangle

c^2 = a^2 + b^2

17^2 = a^2 + (20-12 )^2

17^2 = a^2+ 8^2

a^2 = 17^2 - 8^2

a^2 = 225

a = 15

height = 15 cm

trapezium area , include the height amount:

1/2 * ( 12 + 20 )* 15

=240 m^2

since 1 can can cover 100 m^2

we can use cross multiplication to find out the amount of cans used :

1          :             100

x         :              240

240 = 100x

x = 240/100

x = 2.4

rounded off is 3 cans

hence we need 3 cans

3 * 19.75

hence the only issue you had was putting 2.4 cans. you can not buy 2.4 cans but only 3 cans.

hence you will have to multiple 19.75 * 3 = 59.25 . that was your error

she will travel a distance in the range of 3 - 11 miles

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