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K = C + 8 → C = K - 8

J = K + 5

J + K + C = 72

(K + 5) + K + (K - 8) = 72

3K - 3 = 72

3K = 75

K = 25

J = 25 + 5 = 30

C = 25 - 8 = 17

2(3a + 5) :

First you have to multiply everything inside the bracket by the number outside the bracket: = 2 x 3a + 2 x 5 or = (2 x 3a) + (2 x 5)

This can then be simplified to give the answe...

Step 1: Identify Variables: 5x, 3x, Step 2: take the smaller one to other side with change in sign: 5x-3x-11= 3 Step 3: Take constants to other side with change in sign: 5x-3x = 3 +11 Step 4: Simplify on ...

Quickest Way:

Put Area = Circumference

Pi x r x r = 2 x Pi x r

Using Cancellation of equations,

r = 2

Important: Trial and error takes time - Cannot do while doing a gra...

3/5 of Cake = 5 x 150 g, Cake Weight = 5/3 x 750 g = 1250g

Important, it is not required to calculate the weight of cake given to you. The inverse of "remaining" fraction can directly giv...