Math problem simplif

The school canteen sells chicken and egg sandwiches. it generates a revenue of php 2 for every chicken sandwich sold and php 1.25 for every egg sandwich sold. yesterday, the canteen sold all 420 sandwiches that the staff prepared and generated a revenue of php 615.a. how many sandwiches of each kind was the canteen able to sell yesterday? b. suppose the teacher in charge of the canteen wishes to increase the canteen's revenue from sandwiches sold to php 720. is it possible to do this without raising the price per sandwich? how?

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Which of the following statements is true? a. any four non-collinear points lie in a distinct plane.b. a plane contains at least 3 non-collinear points.c. any two lines intersect at a point.d. through two given points we can draw three lines.