Can anyone please help on these questions please.

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# Question

# Answer

ChiefKiasu

7.

A – B = 25

(1) B = A – 25

A + 12 = 2(B – 12)

A + 12 = 2B – 24

2B = A + 36

B = 1/2(A + 36)

Substituting (1) into (2),

A – 25 = 1/2(A + 36)

2A – 50 = A + 36

A = 50 + 36 = **86 #**

ChiefKiasu

6.

Let A be the total number of balls in basket A at first.

Let B be the total number of balls in basket B at first.

A = B + 18

So (1) B = A – 18

3(A – 64) = B + 64

3A – 192 = B + 64

=> (2) B =3A – 256

Substituting (1) into (2),

A – 18 = 3A – 256

2A = 238

**A = 119 #**

ChiefKiasu

5.

A = 425

B = 189

Let X be the number of marbles transferred.

A – X = B + X

A – B = 2X

=> X = (A – B)/2 = (425 – 189)/2 = **118 #**

ChiefKiasu

4.

A = R

5(A – 36) = R + 36

5A – 180 = R + 36

5A – R = 216

But since A=R,

5A -A = 216

4A = 216

A = 54

So both Andy and Rita has **54 stamps at first #**

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