Some math assistance please
1) Number 2004 is divisible by 12 and the sum of its digits is equal to 6. Altogether how many four digit numbers have these two properteis?
2) Jack rides his bike from home to school uphill with average speed of 10 km/h. On the way back home his speed is 30 km/h. What is the average speed of his round trip?
3)John put magazines on a bookshelf. They have either 48 or 52 pages. Which one of the following numbers cannot be the total number of pages of all the magazines on the bookshelf?
October 1, 2011
6 Comments • Newest first
[quote=michaljatof]The answer to 2 isn't 20 km/h, it's 15 km/h.
Lets say the road from home to school was 30 km, then the ride to school would take 3 hours, and the ride home would take 1 hour.
In 4 hours he traveled 60 km: 60/4=15 km/h[/quote]
o gee ty wats question 3 though?
ohh gosh ty
1. Make a graph. You should see a pattern pretty quickly. Just list all the 4-digit numbers that have digits the sum of 6, then check which one(s) are divisible by 12.
2. 20 km/h. You do (10+30)/2
3. Do something like x=(48y)+(52z) or something and see which one x can not equal o.o (too lazy to do it right now)
@HobosCanFly: for the first question the choices are 10 , 12 , 13 , 15 ,18 the ones i posted b4 are choices for the last question
[quote=victor111]numbers are 500,524,568,588,620[/quote]
Didnt you say four digit numbers? o-o
[quote=Warhodes]1) What kind of dumbass question is that.
2) 20, add them together and then divide by the number of values (In this case, 2).
3) What are the numbers?[/quote]
numbers are 500,524,568,588,620