book Maths Puzzle Numerical Ability

If log8 (little 8)M= log5 (little 5)7/log5(little 5)8, then M = ?

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book Other Question

If a 17-ft. ladder is leaning against a building. The base of the ladder is 7 feet from the base of the building. How high up the side of the building is the top of the ladder? Help Please!
Problem:
Jon and Lauren have a combined income of 48,000. Lauren earns 3,000 more than half of what Jon earns. How much does each earn?