Thank you, ChewingPencilLine!!!

Pls help. 3 questions:


1)\tA and B had an equal amount of money. Everyday, A spent $36 and B spent $48. When B had spent all his money, A had $240. How much money did each of them have at first?

2)\tD has $160 more than R. If D gives R 1/10 of his money, he will have 3 times as much money as Raja.
a)\tHow much money does R have at first
b)\tExpress R’s money as a fraction of D’s money?


3)\tB had 400 sticks of chicken satay and mutton satay in all. After selling 1/9 of the chicken satay and 15 sticks of mutton satay, he had ¼ as many mutton satay as chicken satay left. How many sticks of chicken satay did B have at first?

MathIzzzFun:

doraemo:

Please help...

A wooden crate had a mass of 24 ½ kg when it was half filled with iron nails. When 11kg of iron nails were taken out, the wooden crate was only ¼ full. What was the mass of the wooden crate and the iron nails when the crate was completely filled with iron nails?

mass of wooden crate + mass of 1/2 (=2/4) of iron nails --> 24.5 kg
mass of 1/4 of iron nails --> 11 kg

mass of wooden crate filled with iron nails
= mass of wooden crate + mass of 4/4 of iron nails
--> 24.5 kg + 2 x 11 kg = 46.5 kg

cheers.

got it ....thank you!

Please help…

A wooden crate had a mass of 24 ½ kg when it was half filled with iron nails. When 11kg of iron nails were taken out, the wooden crate was only ¼ full. What was the mass of the wooden crate and the iron nails when the crate was completely filled with iron nails?

oic…

Thank you MathIzzzFun & tianzhu !!!

MathIzzzFun:

doraemo:

Help Needed..


120 boys are standing in front of their lockers, numbered from 1 to 120. At the start, all lockers are opened. A teacher calls out ‘1’, and since 1 is a divisor of all the numbers, all the boys close their lockers. The teacher then calls out ‘2’ , and only those boys whose locker numbers are divisible by 2 will open their lockers. The teacher then calls out ‘3’ . Those boys whose locker numbers are divisible by 3 will open their lockers if they are closed, or close their lockers if they are opened. This process is continued until ‘120’ is called out. How many lockers will be closed at the end of the entire process?

may I know the source of the question - school practice question or MO question ?

10 lockers will be closed.

cheers.

Hi MathIzzzFun
Thank you for your help. MO question.
10 lockers will be closed?

Help Needed…


120 boys are standing in front of their lockers, numbered from 1 to 120. At the start, all lockers are opened. A teacher calls out ‘1’, and since 1 is a divisor of all the numbers, all the boys close their lockers. The teacher then calls out ‘2’ , and only those boys whose locker numbers are divisible by 2 will open their lockers. The teacher then calls out ‘3’ . Those boys whose locker numbers are divisible by 3 will open their lockers if they are closed, or close their lockers if they are opened. This process is continued until ‘120’ is called out. How many lockers will be closed at the end of the entire process?

Thank you!!! MathIzzzFun

MathIzzzFun:

doraemo:

Five workers A. B. C, D and E work in an office for 5 days from Monday to Friday.

Given that
\to For each day from Monday to Friday, exactly 3 workers are at work while 2 workers are enjoying their day-off.
\to No worker can be off for 2 consecutive days, neither can they work for 3 consecutive days.
\to B works 2 days more than E; there is only one day when A and C work together; C works on Monday.

Who are the 3 workers who work on Friday?
(Select the correct answer from those given below)
A,B,D
A,B,C
B,C,E
A.C,D

May I know the source of the question ?

ans = A,B,C

cheers.

Thanks!
A,B,C? think is from math olympiad

Five workers A. B. C, D and E work in an office for 5 days from Monday to Friday.

Given that
\to For each day from Monday to Friday, exactly 3 workers are at work while 2 workers are enjoying their day-off.
\to No worker can be off for 2 consecutive days, neither can they work for 3 consecutive days.
\to B works 2 days more than E; there is only one day when A and C work together; C works on Monday.

Who are the 3 workers who work on Friday?
(Select the correct answer from those given below)
A,B,D
A,B,C
B,C,E
A.C,D