book Maths Puzzle Numerical Ability

please help
what is 6 radical 20 - 2 radical45

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book Other Question

Each number below is the number of miles the Hoover family has driven in a week. Determine the frequency of the class interval for this data.

142 284 557 354 315
265 329 157 3
Find the sum.

3/4 + 1/6