Answer:
RS = 75.3
Step-by-step explanation:
You need to set up the proportion of corresponding sides.


7(RS) = 31(17)
= 527
RS = 527/7 = 75.2857...
= 75.3
Six million, seven thousand two hundred
Answer:
18 minutes
Step-by-step explanation:
Sophie can peel all potatoes in 45 minutes, in 1 minute she can peel:
Simon can peel all potatoes in 30 minutes, in 1 minute he can peel:
Together, in 1 minute they can peel:
- 1/45+1/30= 2/90+3/90= 5/90= 1/18 of all the potatoes
To peel all the potatoes they need:
- 1 ÷ 1/18= 1 × 18= 18 minutes
So it will take them 18 minutes to peel all the potatoes