exam Maths Puzzle Numerical Ability

3 girls & 4 boys are to be seated in a row containing 7 chairs. If the chairs at both ends of the row must be occupied by girls, in howmany different ways can the children be seated?

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exam Other Question

Find the missing values that solve this equation.
y = 5 -4x

(5, ____) (1, ____) (-1, ____)

I need the missing points and the steps :) A tea mixture was made from 40lbs of tea costing $5.00 per pound and 10lbs of tea costing $3.50 per pound. Find the cost of the tea mixture per pound.