Answer:
1. = 1,170km
2. =17days
3. =240$, 300$
Explanation:
1. A fast vehicle travels 390km in 3 hours. At this rate, how far will it travel in 9 hours?
method 1 -- if 390km = 3hours
? 1hour
CROSS MULTIPLY.
390km × 1hour ÷ 3hours = 130km
-- if 130km = 1hour
? 9hours
= 1,170km
method 2 -- 390km × 9hours ÷ 3hours
3,510 ÷ 3hours
= 1,170km
2. A stock of food is enough to feed 30 orphans for 12 days. How many days will the food last if 10 more orphans are added ?
method 1 -- if 30orphans = 12days
42orphans ?
CROSS MULTIPLY
42orphans × 12days ÷ 30orphans = 16.8days
since 0.8 of a day cannot exist, we round it off to get 17 days.
=17days.
3. If 480$ is divided in the ratio 3:5 between two girls, how much did each one receive?
Girl 1 : Girl 2 Total
3 : 5 8
Girl 1 : Girl 2
3/8 : 5/8
Girl 1 : Girl 2
3/8 × 480$ : 5/8 × 480$
Girl 1 : Girl 2
240$ : 300$
(80% SURE SO I ACCEPT ANY CORRECTION IN QUESTION 2.)