Question 1056684
Hi there,
Make adults = x
Children = y
x + y = 101 .......(1)
7x + 4y = 491......(2)
Multiply Eq(1) by 4
4x + 4y = 404.......(1)
7x + 4y = 491.......(2)
Subtract Eq(1) from Eq(2)
3x   = 87
x = 29
Substitute x = 29 into Eq(1)
x + y = 101
29 + y = 101
y = 101 - 29
y = 72
29 Adults and 72 children went to the zoo.
Hope this helps :-)