(a(i))[1]
Choose a marble at random from the bag, then replace it. Write down the probability that the marble is black.
(a(ii))[2]
How many black marbles did she put into the bag?
(b(i))[1]
The cost of 2 white marbles and 5 black marbles is 155 cents. Complete the equation $2w + 5b = \square$.
(b(ii))[1]
The cost of 3 white marbles and 10 black marbles is 290 cents. Write down an equation to show this information.
(b(iii))[3]
Solve your two equations to determine the value of $w$ and the value of $b$.
(c)[2]
Complete the statement concerning the value of $m$.
(d)[2]
On the grid, draw an accurate net of the smallest closed box that can hold a marble.