exam Maths Puzzle Numerical Ability

the school cafeteria surveyed the student body and discovered that 13/15 of the students listed pizza as their favorite lunch. There was a total of 78 students that liked pizza best. how many students were in the student body?

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exam Other Question

C-2 Plumbing-A 4-ft-high cylindrical pipe has a diameter of 3 in. If water weighs 62.4 lb/ft^3(cubed), what is the weight of water in the pipe when filled to the top?(Hint: Change the diameter to feet.) Hello...um i need to find the Value Of X and Y

4x=-5y+40
x=-y+9

i know itz pretty easy but i kinda forget everything during the summer...can u plz help me..it will b greatly appreciated =]