1) B=Bikers H=Hikers
H=B+178 (178 MORE HIKERS THAN BIKERS)
B+H=676 (TOTAL EQUATION)
COMBINE EQUATIONS (Plug in H from first equation into second one)
B + B +178 = 676
SOLVE FOR B
2B=498
B=249 Total Bikers
Now for Hikers go back to the first equation we made
H= B+178.... Plug in B =249 and get
H=427
2) Children =C AND Adult =A
C+A=764 .............. C=764-A
2C+5A=2992
COMBINE EQUATIONS
2(764-A)+5A=2992
You can solve for A.
A=488
Now c GO BACK TO FIRST EQAUTION
C+A=764 and solve for C.
C=276
