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Pair of Linear equations in two variables# chapter 3 class10 ex 3.1 Q.no 1# ex 3.1 Q.no 1 class10#ex 3.1 class10 Q.no 1 10 students of a class 10 took mathematics quiz if number of girls 4 more than number of boys#5 pencils and 7 pens cost 50 rupees 7pencils and 5 pens cost 46 rupees #