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Algebra
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100
5x5x5x5x5x5
56
100
15p2 / 5p
3p
100
60 is the same as...
1
100
(t5)4
t20
100

2x+3x =

5x

100

What is full of holes but still holds water?

A sponge

200
23 x 26
29
200
68 / 62
66
200
74 / 74
70 or 1
200
(2 a4)3
8a12
200

3x+2y-x+4y =

2x+6y

200

I follow you all the time and copy your every move, but you can’t touch me or catch me. What am I?

Your Shadow

300
10f x 10f
100f2
300
e100 / e25
e75
300
6p0
6
300
(xy)z
xyz
300

4x xx6x=

24x^2 

300

I am an odd number. Take away a letter and I become even. What number am I?

Seven

400
3p x 4p8 x p2
12p11
400
10a5 b2 / 5a3 b
2a2 b
400
(d3 x d4) / (d5 x d2)
d0 or 1
400
((de)f)g
dfg efg
400

4x^2 - 3xy+4x-8yx+x^2=

5x^2-11xy+4x

400

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Chicago

500
6p4 x p7 x p
6p12
500
(3j2 x 2j8) / (3j5 x j4)
2j
500
(e3 x e3) /e6
e0 or 1
500
(128/122)3
1218
500

3xy xx 4y-5xy+6x^2y-4xy^2 -2x xx7xy

8xy^2-8x^2y-5xy

500

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

A River