Which of the following is a rational equation?
a. 4-2(x-1)=x+3
b. 1/2x-1/3=4-x
c. 0.7x-3=0.09(x-5)
d. 6/x - 1 = 4/(x-2)

B and D

Step-by-step explanation:

Since they're the fractions

Colin gets pic 'n mix when at the cinema and makes his bag up with 3 types of sweet. He picks 3 times as many cola bottles as smarties. He also picks twice as many smarties as marshmallows. What proportion of the bag of sweets are cola bottles?
Give your answer in its simplest format