Dr frost Flashcards
4 bricklayers can build a certain wall in
20 days. How long would it take
5 bricklayers to build it?
16
6 bricklayers can build a certain wall in
12 days. How long would it take
3 bricklayers to build it?
24
It takes 7 men 16 hours to dig some holes. How long would it take 4 men to dig the same holes?
28
8 bricklayers can build a certain wall in
25 days. How long would it take
5 bricklayers to build it?
40
2 taps fill a tank in 27 hours.
How long would it take to fill the tank if only
9 taps are working?
6
In a school,15 classrooms are required if each class has 32 pupils.
How many classrooms would be required if the class size has reduced to 20?
24
It takes 7 men 9 hours to dig some holes. How long would it take 3 men to dig the same holes?
21
4 taps fill a tank in 44 hours.
How long would it take to fill the tank if only 11 taps are working?
16
Lyna is making a fruit cocktail.
She is using a recipe with the following ingredient list:
Ingredients for 8 cocktails
140 m orange juice
130 g strawberry puree
60 mapple juice
Lyna wants to make 40 cocktails.
She has 700 morange juice.
Determine whether she has more than enough, exactly enough, or not enough orange juice.
More than enough
Exactly enough
Not enough
Exactly enough
The variables c and d are in inverse proportion.
Use this information to complete the table.
c/ 2 0.5 _____
d/ 1 ______ 8
1) 0.25
2) 4
