exam Maths Puzzle Numerical Ability

Q: log x + log 20=2. Then x =

By using the calculator I know that x=5
How would I work this problem without a calculator?

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exam Other Question

1. Evaluate. 50 ÷ 5 - 80 ÷ 10

A) 3 B) 1 C) 4 D) 2


2. Evaluate. | -5 | - | 3 |

A) 2 B) 8 C) -2 D) -8

3. Add. 3 1/5+2 1/4

6.
Explain how solving an "and" compound inequality is similar to finding the intersection of two sets

Thank you.