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CoolMathWiz

6 Questions
3 Answers

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524

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COUNTING

How many ways are there for 20 rectangular brick with dimensions
1 X 3 to fill a grid with dimensions 3 X 20 ?

CoolMathWiz Aug 10, 2020

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516

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+30

Clock Problem

At certain minutes past 5, ‘6’ on the clock is at the middle of the minute-hand and the hour-hand. How
many minutes later ‘6’ on the clock is at the middle of the minute-hand and the hour-hand again?c

CoolMathWiz Aug 10, 2020

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537

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REDACTED

REDACTED AS I GOT IT

CoolMathWiz Aug 9, 2020

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567

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Sum of values

If the highest common factor and the lowest common multiple of a, b and c are 2019 and 20190
respectively, find the sum of possible value(s) of a.

CoolMathWiz Aug 9, 2020

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641

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+30

Casework

Bella, Aiden, Chris and Dylan join a math game competition. Each round 2 people among the 4 people are
randomly chosen to have a match. If after n rounds there must be at least two people matched at least four
times already, find the least value of read more ..

CoolMathWiz Aug 9, 2020

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509

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+30

Percentage

A shop is selling a batch of goods and its selling price is set at an expected profit rate of 40%. After selling
80% of them, the shop sells the remaining goods at a discount. After selling the remaining goods at an x%
discount rate, the actual profit read more ..

CoolMathWiz Aug 9, 2020

+30

0

Can someone please help!!!

CoolMathWizAug 11, 2020

+30

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Nevermind, I got it!

CoolMathWizAug 9, 2020

+30

+1

They are all 3-4-5 triangles. Through pythagorean theorem $CB=20$ . Through similar triangles, $EB=5$ so $x = 25 - 5 = \boxed{20}$

And we are done!

CoolMathWizAug 9, 2020