in a certain examination 52 candidate offers biology,60 offers history,96 offers maths, if 21 offered both biology and history,22 offered maths and biology, and 16 offered maths and history, if 7 candidates offered all the subject. how many candidates were there for the examination​

There are 135 candidates.

Step-by-step explanation:

we know that:

52 offer biology

60 offers history

96 offers maths

21 offered both biology and history

22 offered maths and biology

16 offered maths and history

if 7 candidates offered all the subject.

We want to find the total number of candidates.

We start by adding the numbers for each particular exam:

(52 + 60 + 96)

Now, there are 21 that offered both biology and history, then these 21 are counted in the 52 for biology and in the 60 for history, then we need to subtract 21 (because we are counting it two times)

(52 + 60 + 96) - 21

The same happens for the 22 that offered maths and biology, and 16 that offered maths and history, then we get:

(52 + 60 + 96) - 21 - 22 - 16

And there are another 7 that offered for the 3 subjects, then we are counting these 7 ones 3 times, this means that we need to subtract 7 two times.

then we get:

(52 + 60 + 96) - 21 - 22 - 16 - 7 - 7

This is the total number of candidates, if we solve the equation we get:

candidates = (52 + 60 + 96) - 21 - 22 - 16 - 7 - 7 = 135

So we can conclude that there are 135 candidates.

(2,6)

step-by-step explanation:

cause i just did this and got the answer

you're welcome

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true