book Maths Puzzle Numerical Ability

Write without exponents:

64 2/3

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book Other Question

3. y=-x-5 please solve these im not stupid the questions are just hard
x=-3
4. y=x-6
y=-4
5.y=-x-4
y=x+2
6. y=x-3
y=-x+5 While at the park, I saw boys and dogs. Counting heads, I got 32. Counting legs, I got 104. How many boys and dogs were there?