Piles
There are twenty gifts stacked up into four piles.
The first pile has 3 less than the second pile.
The second pile has two more than the third pile.
The fourth pile has twice as many as the second pile.
How many gifts are in each pile?
A box of biscuits
A box of biscuits contains 36 biscuits. 20 biscuits have foil wrappers. 15 are chocolate biscuits with foil wrappers. If 9 are not chocolate and do not have a foil wrapper, then how many chocolate biscuits are there?
Using these we can make equations:
ReplyDeletea = first
b = second
c = third
d = fourth
b = 3 + a
b = c + 2
d = 2b
3 + a = c + 2
a = c - 1
b = c + 2
c = c
d = 2c + 4
c - 1 + c + 2 + c + 2c + 4 = 20
5c + 5 = 20
5c = 15
a = 2
b = 5
c = 3
d = 10