Checkpoint: proportion, rates and scales

Is 6 : 9 equal to 8 : 12?

• No, because 6 and 8 differ
• Yes, because 6 × 8 = 48 is even
• Yes, because 6 × 12 = 72 and 9 × 8 = 72

Seven pens cost ₹161. What do four cost?

• ₹92
• ₹158
• ₹644

A parking charge is ₹20 at the gate plus ₹5 an hour. Are hours and charge in direct proportion?

• Yes, because each hour adds ₹5
• Yes, because the charge rises with the hours
• No. 1 hour costs ₹25 and 2 hours cost ₹30. 25 ÷ 1 and 30 ÷ 2 differ

A tap fills 45 litres in 5 minutes. How much does it fill in 8 minutes?

• 0.9 litres
• 72 litres
• 72 minutes

A map has a scale of 1 : 25,000. Two places are 6 cm apart. How far apart are they?

• 150 km
• 25,000 cm
• 1.5 km