Math problems for January 26 2012

Problem #1


What is the value of the whole number N, if


N = 1/2 of 2/3 of 3/4 of 4/5 of 100?


Problem #2


Ana divides the number N by 8 correctly and gets .25 as her answer. Barney multiplies the same number N by 8. What answer should he get?


Problem #3


At a special sale, all shirts sell at one price and all caps sell at another price. Kathy pays $30 for 3 shirts and 2 caps. Marc pays $23 for 1 shirt and 5 caps. For how many dollars does each shirt sell?



Problem #4


At the Math Store each circle costs one amount and each square costs another amount. Five circles plus one square cost 20 cents. Two circles plus three squares cost 21 cents. At these prices, how many cents does twelve circles plus five squares cost?


Problem #5


Every person in a room shakes hands with each other person in the room exactly once. There are total of 15 handshakes. How many people are in the room?


Problem #6
Each row of *s has two more *s than the row immediately above it, as shown. Altogether, how many *s are contained in the first twenty rows?


*


***


*****


*******


Problem #7


Maria writes the same whole number instead of ? and get a true statement. Jon does the same as Maria and also gets a true statementon and Maria choose different numbers. What two numbers do they choose?


12 + (? x ?) - (7 x ?) = 0