Difference between revisions of "AMC 12C 2020"

(Problem 3)
(Problem 4)
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What is the numerical value of  <math>1^{3} + 2^{3} + 3^{3} + … + 11^{3}</math>?
 
What is the numerical value of  <math>1^{3} + 2^{3} + 3^{3} + … + 11^{3}</math>?
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==Problem 5==
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<math>10</math> cows can consume <math>20</math> kilograms of grass in <math>5</math> days. How many more cows are required such that it takes all of the cows to consume <math>80</math> kilograms of grass in <math>8</math> days?

Revision as of 11:24, 20 April 2020


Problem 1

What is the sum of the solutions to the equation $(x + 5)(x + 4) - (x + 5)(x - 6) = 100$?


$\mathrm{(A) \ } -10\qquad \mathrm{(B) \ } -3\qquad \mathrm{(C) \ } 5\qquad \mathrm{(D) \ } 10\qquad \mathrm{(E) \ } 15$

Problem 2

How many increasing subsets of ${{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}}$ contain no $2$ consecutive prime numbers?


Problem 3

A field is on the real $xy$ plane in the shape of a circle, centered at $(5, 6)$ with a a radius of $8$. The area that is in the field but above the line $y = x$ is planted. What fraction of the field is planted?


Problem 4

What is the numerical value of $1^{3} + 2^{3} + 3^{3} + … + 11^{3}$?


Problem 5

$10$ cows can consume $20$ kilograms of grass in $5$ days. How many more cows are required such that it takes all of the cows to consume $80$ kilograms of grass in $8$ days?