exam Maths Puzzle Numerical Ability

the values of a, b, c, and d are 1, 2, 3, and 4, but not necessarily in that order. what is the largest possible value of ab+cd+da?

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exam Other Question

one side of a triangle is twice the shortest side. the third side is 4 feet more than the shortest side. the perimeter is 20 feet. find all three sides. Jill had $3.50 in nickel and dimes. If she has 50 coins, how many of each type of coins does she have?