exam Maths Puzzle Numerical Ability

Roberto needs 10 kilograms of clay for a ceramics project. He already has three pieces that weigh 1.3 kg, 2.4 kg, and 0.9 kg. How much more clay does he need?

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can u pleize help wit diz one
3/8 is___%3/4
thanx...=P
The ones digit of a two-digit number is 4 times the tens digit. If the digits are reversed, the new number is 54 more than the original number. Find the number.