in a class 2/5 of the pupils are boys if there are 30 girls how many more girls than boys are there.

10 more girls.

Explanation:

If 2/5 of the pupils are boys and 30 pupils are girls, that means that there is a total of 50 pupils. Because 2/5 of 50 is 20, then 20 pupils are boys. This means that 3/5 of these pupils are girls, because 3/5 is equal to 30. Now that we know 20 pupils are boys, we can subtract and identify how many more girls there are. 30 - 20 = 10, which means there are 10 more girls than boys.

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I’m going to infer you said parallel.solve for yy= -1/2x+7/4lines that are parallel have the same slope, different y intercept.so we know m is -1/2then from there solve for y intercept.