Beatrice:

Ron paid $12 for 4 pens and 6 pencils. Each pen cost 6 times as much as a pencil.
a) Find the cost of a pencil.
b) Find the total cost of 5 pens.


Sean:

The mass of a dictionary is 3.5 kg. the mass of a phone directory is 2.1 kg more than the mass of the dictionary. Find the total mass of 7 dictionaries and 3 phone directories.


Jonathan:

390 people are swimming in a pool. 5/7 of the male swimmers is equal to 2/5 of the female swimmers. How many female swimmers are there?


Jia Min:

A container filled with stones has a mass of 25 kg 246 g. When the same container is filled with sand, the mass is 8 kg 650 g lighter than the container filled with stones. If the mass of the stones is thrice as heavy as the mass of the sand, find the mass of the container in kg and g.


Yang Dingg:

Fill in the blank:

1,1,2,6,18,36,36,36,72,216,648,1296,1296,__________

Zi Ying:

Fill in the blank:

1, 4, 9, _____, 25


Betty had a 21.22m long ribbon and Cheryl had a 11.66m long ribbon. After both of them used the same length of ribbon to make some flowers, Betty’s ribbon was 5 times as long as Cheryl’s ribbon. What was the length of ribbon used by each girl to make flowers?


A bakery produced 3848 buns. On the first day, 128 customers came to buy 15 buns each. How many buns were left at the end of the second day if 97 customers came to buy 8 buns each?