in a consumer -perference survey of an item, fifteen were found to use Brand A, twenty were found to use Brand B, five were found to be in the habit of using both brands A and B. Find the number of consumers using at least one of the two brands of the item.

In a survey of 600 students in a school,150 students were found to be taking tea and 225 students were taking coffee.100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee.

The mean and SD of 20 items were found to be 12.5 and 2.1 resp.After that,one item of 23 being added: find the AM and SD of 21 items

In a survey of 600 students in a school, 150 students were found to be taking tea and 225 taking coffee, 100 were taking both tea and coffee. Find how many students were taking neither tea nor coffee?

The mean of 16 items was found to be 30. On rechecking, it was found that two items were wrongly taken as 22 and 18 instead of 32 and 28, respectively. Find correct mean.

There are four possible answers for each questions which are represented by (A), (B), (C ) and (D). Only one answer is correct out of these answer. Choose correct answer and write down the answer in English alphabet in the given box. The two brands of chocolate are avilable in the packing of 10 and 12. If have to make both brands of chocolate with the same quantity then how many packs should purchase at left each brand ?

In a survey of 600 students in a school, (i) 160 students were found to be taking tea , 215 taking coffee , 150 were taking both tea and cofee. (ii) 150 students were found to be taking tea and 225 taking coffee , 100 were taking both Tea and Coffee Find how many students were taking neither tea nor coffee.

Two solutions A and B were found to have pH value of 6 and 8 respectively .The inference that can be drawn is

A person ordered 4 shirts of brand A and some shirts of brand B. The price of one shirt of brand A was twice that of brand B. When the order was executed, it was found that the number of the two brands has been interchanged. This increased the bill by 40%. The ratio of the number of brand A shirts to that of brand B shirts in the original order was