exam Maths Puzzle Numerical Ability

Use the elimination method to solve the system.
.18f-.3g=3
.15g-.9f=-5.55

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a road side stand bought 11 large baskets of eggs from a farmer and sold 39 small baskets of eggs, which hold fewer than a dozen. there were 19 eggs left over. how many eggs does a large basket hold? The sum of the base and the height of a triangle is 20cm. Find the dimension for which the area is a maximum