let the no of forks be x and no of spoon be y
1.7x + 1.3y = 37.9
5.6x + 5.4y = 147.2
solving for x and y, we get
multiplying eqn 1 by 5.6 and equation 2 by 1.7 we get
9.52x + 7.28y = 212.24
9.52x + 9.18y = 250.24
subsrtracting eqns we get
7.28y - 9.18y = 212.24 - 250.24
1.9y = 38
y = 20
x = (37.9 -1.3*20)/1.7
= 7