Hi! I am stuck with these mathematics questions again.

These are the questions:

4/5 of the children at a childcare centre were girls. After 14 girls and 1 boy had left the childcare centre, the ratio of the number of girls to the number of boys who remained at the childcare centre became 7 : 2. How many children were at the childcare centre at first?

Mrs Wong brought a bag of stickers to class. If she gives each pupil in her class 5 stickers each, she will have 20 stickers left. If she gives them 8 stickers each, she will need to buy another 88 stickers. How many stickers does Mrs Wong have?

Kimberly bought some sausages for a gathering. Her friends ate 3/4 of **the sausages** and 1/4 of **a sausage**. Kimberly then ate 3/4 of **the remaining sausages** and 1/4 of a sausage. If there were **no sausages** left, how many sausages did Kimberly buy?

Kenneth and Joanna were each given some money. If Kenneth spent **half of the amount spent by Joanna**, he would have $2400 left. If Kenneth **spent twice as much as Joanna**, he would would still have $900 left when **Joanna had spent all her money**.

a) How much money was given to Kenneth?

b) How much less money than Kenneth did Joanna have?

440 teachers and pupils participated in a tree planting event. Each teacher planted 2 trees and each group of 4 pupils planted 3 trees. If 455 trees were planted altogether during the event, how many pupils participated in the event?

Celestine has some twenty-cent coins and fifty-cent coins in the ratio 3 : 4. Given that all the coins add up to $104, how many fifty-cent coins does Celestine have?

There was a total of 225 counters in Bags A, B, C, and D. 15 counters from Bag A were given away, 24 counters were added to Bag B, half of the counters in Bag C were sold and the number of counters in Bag D were doubled. As a result, there was an equal number of counters in each bag.

a) Find the number of counters in Bag B at first.

b) How many more counters were there in Bag C than Bag D at first.

At first, Wendy had twice as many balls as Fiona. After Wendy sold some of her balls, Fiona had twice as many balls as she had. Wendy sold each ball for $6 and for every 4 ball that were sold, she received a bonus of $5.

a) Given that Wendy received $1218 in all from the sale of the balls, how many balls did she sell altogether?

b) How many balls did Wendy have at first?