Question: section b rates and ratios1andnbspandnbspandnbspandnbspandnbspandnbspandnbspandnbspandnbsp fully simplify the following ratiosaandnbspandnbspandnbspandnbspandnbsp...
Section B: Rates and Ratios
1 Fully simplify the following ratios:
b) 4 minutes: 2 hours
2 The ratio of a boy’s weight to that of his father is 3:8. If the boy weighs 28.8 kg, how much does his father weigh?
3 A weed spray is made of wetting agent and herbicide in the ratio 97:3 respectively. To make 20L of weed spray, how much herbicide would be needed?
4 Mandy purchased 42L of petrol for $66.36. What was the cost per litre?
5 If a car uses 12L of fuel to travel 100 km, how much will it use to travel 375 km?
6 A tap is dripping at a rate of 32 drops per minute. If each drop contains 1.4 mL of water, calculate the number of litres dripping from the tap in a day.
7 Which of the following packet sizes of coffee is the best buy?
a) Small: 150 g for $5.18
b) Large: 1 kg for $45
Show working to justify your answer.
8 Mark cycled at a speed of 24 km/h for 40 minutes. How far did he travel?
9 A tennis ball is served and travels 18 m in 0.54 seconds before hitting the ground.
At what speed in km/h was the ball served?