book Maths Puzzle Numerical Ability

how do I change a fraction to decimal?

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In 1999, cigarette consumption in the US was 125 packs per capita. This rate of consumption was 5/8 of what it was in 1980. Find the rate of consumption in 1980. I need your help ..............

1. Expand (s-u)^5.

2. Evaluate 10!

3. Find the fifth term in the expansion of (e+2f)^8.

4. Use Pascal's triangle to expand the binomil (