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In a cinema, male to female ratio is - 1:3. The ratio of the females, who like popcorn to females who don't like popcorn is 2:1. 10 girls don't like popcorn. How many people are there in the cinema altogether?

Ratio of females who like popcorn to the females who don't like popcorn is 2:1. If 10 females don't like popcorn, then (10 *2) 20 females like popcorn. 10+20 = 30 females altogether. 30/3= 10 males altogethe...
YB
Answered by Yashaswi B. • Maths tutor
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R and B are directly proportional variables. When R = 9, B = 3. What does R equal when B = 14?

R and B are directly proportional variables. Therefore, we can write a relationship between them as R = kB where k is a proportionality constant. We can rearrange this equation to calculate the value of k: R...
LW
Answered by Liban W. • Maths tutor
4279 Views

Simplify: ((3x^2)-x-2)/(x-1).

Firstly, simplify the numerator by factorising the quadratic, to give a numerator of (3x+2)(x-1). Now, divide through by (x-1), to give (3x+2).
OK
Answered by Oscar K. • Maths tutor
5053 Views

Explain the chain rule of differentiation

The chain rule can be used to find more complex derivatives.For example, in the case of: y = (5x + 2) 5 To find the derivative in the ordinary fashion, one would need to expand the brackets to:y=3125x 5 +625...
TH
Answered by Toby H. • Maths tutor
4614 Views

Solve x^2+7x+12=0

We need the equation in the form (x+a)(x+b)=0. The numbers in the brackets (a and b) must multiply together to get the constant at the end of the equation, in this case 12. The numbers (a and b) must add tog...
AS
Answered by Amy S. • Maths tutor
4124 Views