book Maths Puzzle Numerical Ability

Casey has 10/8 pan of brownies. He is going to give each child a portion of size 3/4 of a full pan. How many children can he serve? What part of the portion is left over?

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Confused about problem. Need to solve this but I do not know how to use the formula. Need to know the sum of pairwise comparisons.

1+2+3+...+498+499+500 The sum of a certain number and second number is -42. The first number minus the second number is 52. Find the numbers.