fraction numbers in answer question

fractions.exam

{
	name: Fractions test
	questions: [
		{
			name: Question 4
			variables: {
				a: "sa*random(1..9)"
				b: "sb*random(1..9)"
				c: "sc*random(1..9)"
				sa: "random(1,-1)"

				sb: "random(1,-1)"
				sc: "random(1,-1)"
				a1: "random(1..9)"
				b1: "if(a*b2=a1*b,b2+1,b2)"
				c1: "sc1*random(1..9)"
				s1:"random(1,-1)"
				sc1:"random(1,-1)"
				b2: "random(2..9)"
			}

			statement: """
				Solve the simultaneous equations for $x$ and $y$. Input your answers as fractions NOT as decimals.
			""" 

			parts: [
				{
					type: GapFill
					prompt: """
						\[ \begin{eqnarray}
							\simplify[1111110111111111]{{a}x+{b}y}&=&\var{c}\
							\simplify[1111110111111111]{{a1}x+{b1}y}&=&\var{c1}
							\end{eqnarray} 
						\]

						$x=\;$[[0]]
						$y=\;$[[1]]
					"""
					gaps: [ 
						{type: jme
						answer: "{c*b1-b*c1}/{b1*a-a1*b}"
						answersimplification: "1111111111111111"
						notallowed:{strings:[.],message: input as a fraction or an integer not as a decimal}
						marks: 1}
						{type: jme
						answer: "{c*a1-a*c1}/{b*a1-a*b1}"
						answersimplification: "1111111111111111"
						notallowed:{strings:[.],message: input as a fraction or an integer not as a decimal}
						marks:1}                    

					]
				}   
			]
			advice: """ 
				This                
			"""
		}
	]
}