exam Maths Puzzle Numerical Ability

Simplify

3(1-5) - ((1-7)(-5))=

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exam Other Question

ok im really confused about the whole thing. i failed algebra last year now im trying to do it again this year but i dont get the word problems at all. for example "If I take a fourh of a number away from half the number, I get 10. What is the number?" One bacth of dough makes 15 ornaments. How many ornaments can be made with 3 batches of dough?