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Questions in Grade Middle-school

[Open]Tom and Rob are brothers who like to make bets about the outcomes of different contests between them. Before the last bet, the ratio of the amount of Tom's money to the amount of Rob's money was 4:7. Rob lost the latest competition, and now the ratio of the amount of Rob's money to Tom's money is 8:3. If Rob had $280 before the last competition, how much does Rob have now that he lost the bet?

[Open]Ramon is saving $7.75 per week to buy a new cellphone. The phone costs $125.00. For how many weeks will he need to save his money?

[Open]What is the difference between the crust and the core?

[Open]Solve for \( x \). \[ \frac{3ax + 2b}{c} = 4d \]

[Open]What is the answer for the following divisions? 1. \(\frac{4}{5} \div \frac{3}{10}\) 2. \(\frac{9}{10} \div \frac{7}{20}\)

[Open]What is 280 million in scientific notation?

[Open]At a leather shop, 50 jackets were sold in February. The shopkeeper wants to encourage the sales team to sell more leather jackets by giving all the sales team members a bonus if the number of leather jackets sold increases by 30% in March. How many leather jackets must the sales team sell in March to receive the bonus?

[Open]What are the four attributes of a proper microscope drawing?

[Open]What is \( \frac{412}{84} \)?

[Open]Which type of pronoun is bolded in the following sentence? "The truck, which sometimes stalls, belongs to our neighbor." A. relative B. indefinite C. interrogative D. demonstrative