Q&A - P4 Math

[doubleblessings]

Michelle went shopping and spent $225 on a watch. She used 5/6 of her remaining money to buy a dress. She was then left with 2/15 of her initial amount of money. How much money did she have at first?

[pecalis]

use model drawing, following onsponge mtd


money left is 1/6 of remaining; is 2u out of 15u
5/6 of remaining spent on dress is 10u out of 15u
so, watch takes up 3u —> 225
1u —> 225/3 = 75
amount of money at 1st is 15u —>75x15=$1125

or can be 225 x 5 = $1125

cheers!

[doubleblessings]

thanks so so much!

[doubleblessings]

Mr Lim had some stickers & stamps for his class. The no. of stickers was half as many as the no. of stamps. After each pupil in the class had received 3 stickers & 8 stamps from Mr Lim, he had 39 stickers and 2 stamps left. What was the total no. of stickers and stamps Mr Lim had at first?

[Michell0328]

A bus can carry 91 passengers.If it start out empty and picks up 1 passenger at the first stop,2 passengers at the second stop,3 passengers at the third stop and so on.After how many stops will the bus be bus?





:?:

[Michaelia0816]

Dear Michell0328,

If you 1+2+3+...+14=91
So answer 14.
I bet P4 doesn learnt algebra so cannot (n+1)+(n+2)+...

[Michell0328]

Tessa exchanges $200 for some $5-notes and $2-notes. She has 5 more $5-notes than $2-notes. Find the number of $5-notes she has.

[Michell0328]

I believe this problem needs to be solved by Guess and Check Method. Since there are 5 more $5 note than $2 note, in its simplest form, there would be 6 $5 note and 1 $2 note. Using Guess and Check Method and making sure that the difference between $5 note and $2 note is kept at 5, the number of $5 note would be 30.

[Michaelia0816]

5xS5=$25

$200-$25=S175
$2+$5=$7
$175 divide $7=25
25+5=30
The answer is 30.

[Michell0328]

Michell wants to put an equal number of sweets into some bags.The total number of sweets she has is more than 50 but less than 90.If she puts 5 sweets into each bag,she has 4 sweets left.If she puts 8 sweets into each bag,she will need 1 more sweet.How many sweets does Michell have??