Question 126346
Each one of the mass values divided by the corresponding # value = 7, so you can conclude the loonies weigh 7 grams each.

So, part a {{{33*7}}} =?

part b {{{133/7}}} =?

part c.  If the bag only contains loonies, then the weight of the coins in the bag must be a multiple of 7.  If {{{152/7}}} is an integer, then the bag contains only loonies, otherwise not.


I'll let you do the arithmetic.  The graph has weight as a function of number.


{{{graph(420,420,-3,25,-20,210,7x)}}}