5. How many times does your heart beat in a day if it beats 70 times per mil 6. The cost of breakfast cereal is R35 for 1 kg . Calculate how much 25 kg of breakfast cereal will cost. Five litres of paint costs R575. Work out the cost of fifteen litres of paint. If you cycled for 3 hours and travelled 54 km , calculate your average spe If oil costs \( \$ 95 \) per barrel and \( \$ 1=\mathrm{R} 8 \), how much does a barrel of oil cost in a car travels a distance of 50 km in 30 minutes. What is its average

Below are the calculations and answers step by step: 1. Heartbeats in a Day:  • The heart beats 70 times per minute.  • In 1 hour there are 60 minutes, so beats per hour = 70 × 60 = 4,200.  • In 1 day (24 hours) beats = 4,200 × 24 = 100,800.  • Answer: 100,800 beats. 2. Cost of 25 kg Breakfast Cereal:  • Given cost is R35 per kg.  • Cost for 25 kg = 25 × R35 = R875.  • Answer: R875. 3. Cost of 15 Litres of Paint:  • Given 5 litres cost R575.  • The cost per litre = R575 ÷ 5 = R115 per litre.  • Cost for 15 litres = 15 × R115 = R1,725.  • Alternatively, since 15 litres is three times 5 litres, cost = 3 × R575 = R1,725.  • Answer: R1,725. 4. Average Speed When Cycling:  • Distance travelled = 54 km in 3 hours.  • Average speed = 54 km ÷ 3 hours = 18 km/hour.  • Answer: 18 km/h. 5. Cost of a Barrel of Oil in Rand:  • Oil costs USD 95 per barrel.  • The exchange rate is $1 = R8.  • Cost in rand = 95 × R8 = R760.  • Answer: R760 per barrel. 6. Average Speed of the Car:  • The car travels 50 km in 30 minutes.  • Convert 30 minutes to hours: 30 minutes = 0.5 hours.  • Average speed = 50 km ÷ 0.5 hours = 100 km/hour.  • Answer: 100 km/h.