exam Maths Puzzle Numerical Ability

I am trying to come up with a answer to this equation?

2.7 + 0.8n = 4

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exam Other Question

15)A pen cost y dollars,how much will 25 such pens cost?_________________.

16)Divide n dollars among 11 people. How much will each get?_________________. The Speed of a B&M freight train is 14 mph slower than the speed of an Amtrak passenger train. The freight train travels 330 mi in the same time it takes the passenger train to travel 400 mi. Find the speed of each train.