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Direct proportions

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  • 3 notebooks cost $9. How much do 12 notebooks cost?
    $36
  • 3 metres of cloth cost $15. How much do 8 metres cost?
    $40
  • 2 kg of sugar costs $8. How much do 5 kg cost?
    $20
  • 5 pens cost $15. How much do 12 pens cost?
    $36
  • 5 oranges cost $10. How much do 8 oranges cost?
    $16
  • 4 notebooks cost $12. How much do 7 notebooks cost?
    $21
  • 8 eggs cost $12. How much do 12 eggs cost?
    $18
  • 4 books cost $8. How much do 6 books cost?
    $12
  • 3 packets of juice cost $6. How much do 11 packets cost?
    $22
  • 3 cakes cost $18. How much do 7 cakes cost?
    $42
  • 2 litres of milk cost $6. How much do 8 litres cost?
    $24
  • 3 pens cost $9. How much do 5 pens cost?
    $15
  • 3 boxes cost $21. How much do 8 boxes cost?
    $56
  • 2 shirts cost $10. How much do 11 shirts cost?
    $55
  • 6 bottles of water cost $18. How much do 10 bottles cost?
    $30
  • 5 oranges cost $30. How much do 2 oranges cost?
    $12
  • 2 tickets cost $14. How much do 9 tickets cost?
    $63
  • 6 bananas cost $18. How much do 11 bananas cost?
    $33
  • 4 bars of soap cost $16. How much do 6 bars cost?
    $24
  • 3 bars of chocolate cost $15. How much do 9 bars cost?
    $45
  • 5 kilos of flour cost $25. How much do 7 kilos cost?
    $35
  • 2 balls cost $16. How much do 5 balls cost?
    $40
  • 2 rulers cost $6. How much do 9 rulers cost?
    $27
  • 5 packets of biscuits cost $20. How much do 9 packets cost?
    $36
  • 5 bananas cost $20. How much do 3 bananas cost?
    $12
  • 3 bags cost $27. How much do 7 bags cost?
    $63
  • 4 plates cost $28. How much do 6 plates cost?
    $42
  • 6 cups cost $30. How much do 4 cups cost?
    $20
  • 5 chairs cost $25. How much do 9 chairs cost?
    $45
  • 4 pencils cost $8. How much do 9 pencils cost?
    $18
  • 4 apples cost $20. How much do 3 apples cost?
    $15
  • 2 kg of rice costs $6. How much do 7 kg cost?
    $21
  • 6 pencils cost $24. How much do 5 pencils cost?
    $20
  • 3 exercise books cost $12. How much do 10 exercise books cost?
    $40
  • 7 mangoes cost $21. How much do 4 mangoes cost?
    $12
  • 7 bottles cost $14. How much do 9 bottles cost?
    $18
  • 4 toy cars cost $12. How much do 11 toy cars cost?
    $33
  • 8 pens cost $16. How much do 15 pens cost?
    $30
  • 4 candles cost $10. How much do 7 candles cost?
    $17.50
  • 2 loaves of bread cost $4. How much do 6 loaves cost?
    $12