Question 119468
What if all the questions were 4-point? then the total
score would be {{{4*40 = 160}}}, but the total score 
should be {{{100}}}
What if all the questions were 2-point? Then the total
score would be {{{2*40 = 80}}} That's too low.
So there has to be a mixture of 2-point and 4-point.
It looks like there are more 2-point than 4-point,
because {{{2*40 = 80}}} is almost there.
Lets chart some numbers
{{{2*40 = 80}}}
{{{2*38 = 76}}} and {{{2*4 = 8}}} the sum is {{{76 + 8 = 84}}}
{{{2*36 = 72}}} and {{{4*4 = 16}}} the sum is {{{72 + 16 = 88}}}
{{{2*34 = 68}}} and {{{6*4 = 24}}} the sum is {{{68 + 24 = 92}}}
{{{2*32 = 64}}} and {{{8*4 = 32}}} the sum is {{{64 + 32 = 96}}}
{{{2*30 = 60}}} and {{{10*4 = 40}}} the sum is {{{60 + 40 = 100}}}
That's the answer
There are 30 2-point questions giving 60 points
and ther are 10 4-point questions giving 40 points for
a total of 100 points on a 40 question test