Question

a,b and c together earn $300 per day if a and ctogether earn $188 and b and c together earn $152 per day what is the earning of c per day?

Answer 1

Let earnings of A, B and C be Rs. a, Rs. b and Rs. c respectively

a+b+c = 300 ...(1)
a+c = 188 ... (2)
b+c = 152 ... (3)

Substituting (3) in (1)
a+152 = 300
=> a = 300-152
= Rs. 148 ...(4)

Substituting (4) in (2)

148+c = 188
=> c = 188-148
= Rs. 40

Therefore, C individually earns Rs. 40 per day.

Answer 2

According to question,
Total earning of a,b and c = $300
or, a + b + c = 300 ......... (i)

Now, total earning of a and c = $188
or, a + c = 188 ............ (ii)

And, total earning of b and c = $152
or, b + c = 152 ...............(iii)

On adding eqn (ii) and (iii), we get :-
a + b + c + c = 188 + 152
or, (a+b+c) + c = 340
or, 300 + c = 340                          [From eqn(i) -- (a+b+c) = 300]
or, c = 40

Therefore, can earn $40 per day.

Hope that helps !!