Asked by terrence
hi. I am new to this. A lot of my friends recommended me to come here. I have two questions that I need help with. Can you please explain how to do this.
1) I pay £56.25 for 15 bags of gravel. How much would 7 bags cost?
2) An aeroplane travels 320km in 20 minutes. How far will it travel in three minutes?
1) I pay £56.25 for 15 bags of gravel. How much would 7 bags cost?
2) An aeroplane travels 320km in 20 minutes. How far will it travel in three minutes?
Answers
Answered by
Arora
In both questions, your method should first be to find the cost/distance for one bag/one minute, and then multiply for the given amount.
a) If you pay 56.25 for 15 bags, then you pay (56.25/15) for 1.
If you pay (56.25/15) for 1 bag, then you pay (56.25/15)*7 for seven.
Hence, 7 bags would cost:
(56.25/15)*7
= 3.75*7
= £25.97
b) If the aeroplane travels 320km in 20 minutes, then it travels (320/20)km in one minute.
Then, it travels (320/20)*3 km in three minutes.
= (320/20)*3
= 12*3
= 48km
a) If you pay 56.25 for 15 bags, then you pay (56.25/15) for 1.
If you pay (56.25/15) for 1 bag, then you pay (56.25/15)*7 for seven.
Hence, 7 bags would cost:
(56.25/15)*7
= 3.75*7
= £25.97
b) If the aeroplane travels 320km in 20 minutes, then it travels (320/20)km in one minute.
Then, it travels (320/20)*3 km in three minutes.
= (320/20)*3
= 12*3
= 48km
Answered by
terrence
thanks I understand now.