Answer :
Let their daily pay be B, T, J. (As their initials suggest). B+T+J=300....1.
B+J=188......2.
T+J=152.......3.
2+3-1=> J = 40.
This suggests Justin's daily pay is $40.
Brenda + Taylor + Justin = $ 300 / day --- equation 1
Brenda + Justin = $ 188 / day ---- equation 2
Taylor + Justin = $ 152 / day --- equation 3
add equation 2 and 3,
Brenda + Taylor + 2 * Justin = $ 188 + $ 152 = $ 340 / day
Subtract equation 1 from this equation,
Justin = $ 40 / day
Brenda + Justin = $ 188 / day ---- equation 2
Taylor + Justin = $ 152 / day --- equation 3
add equation 2 and 3,
Brenda + Taylor + 2 * Justin = $ 188 + $ 152 = $ 340 / day
Subtract equation 1 from this equation,
Justin = $ 40 / day