Question

plz solve all these tree questions

Answer 1

q1- let Aftab's daughter's present age be x yrs and Aftab's present age be y yrs
According To Question
7(x-7) = y-7
7x-y-42=0 - 1st equation
3(x+3) = y+3
3x-y+6 = 0 - 2nd equation

q2 - let the cost of 1 bat be Rs x and that of 1 ball be Rs y
According To Question
3x+6y = 3900 equation 1
x+3y = 1300 equation 2

q3 - let the cost of 1 kg of apples be Rs x and that of 1 kg of grapes be Rs y
2x+y = 160 equation 1
4x+2y = 300 equation 2