There are 4 pieces of white chopsticks, 5 pieces of yellow chopsticks and 6 pieces of blue chopsticks mixed together. If you want to get 2 pairs of chopsticks with the same colour in the dark, at least how many pieces of chopsticks should be taken?

A parent to class teachers asked that "his class how many students?" The teacher replied that "if in addition to all of my students have and then add one-half of my game and then add 1/4 of my game and finally added his son again, there are all 100 children. Question is how many of the students?

there are four kids .if we compute the total ages of three of them the sums are 22,20,17,25 respectively. what is the difference in age between the oldest and the youngest among these four kids?

there are four kids .if we compute the total ages of three of them the sums are 22,20,17,25 respectively. what is the difference in age between the oldest and the youngest among these four kids?

There are fewer  than 30 students in the mathematics class. One half of them play the piano, one quarter play hockey and one seventh are in the school play. How many of the students play hockey?

There are 9 different balls in a bag. Find the number of way(s) to pick 5 balls from the bag and arranged them in a row. (Different orders are considered different ways)

there are four kids.If we compute the total ages of three of them at a time, the sums are 22,20,17,25 respectively. What is the difference in age between the oldest and the youngest among is four kids.

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An had 60 marbles. An wanted to put them in bags so that there are equal numbers of marbles in each bag. How many ways can An equally put the 60 marbles in bags? (Including the case putting in one bag)
Answer: There are .....  ways.