exam Maths Puzzle Numerical Ability

Tony saved $60.70 one week ,$35.00 the second week, and $20.95 the third week. How much money did he save?

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exam Other Question

2/x^2-16y^2 - 1/x^2-3xy-4y^2
This is a fraction and I need to perform the indicated operations. I am lost could you please help?
A brownie pan has dimensions
8" by 4" by 2 3/5".
Compute the volume of the pan.
Express your answer in decimal form.
If the batter is 1.75" deep, what percent of the pan is filled with brownie batter?

7th grade math