book Maths Puzzle Numerical Ability

i need help on this problem:
2.4 + 3[6.8 -(-1.9) + 0.48]
i tried it but i got it wrong , i got : 4.887

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book Other Question

2/3 is to 3/4 as X is to 21/24 ?

I had a bunch of other questions similar to this one but they were all decimals. I don't no why but im banging my head over what I know is an ea A group of people gather around a lake. 1/6 of them are on the north shore, 3/4 of the rest are on the west shore, 1/5 of the remaining people are on the south shore, and there are