exam Maths Puzzle Numerical Ability

3x+2y=-2
2x-3z=1
0.4x-0.5z=-2.1

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exam Other Question

the units digit of a two-digit number is 3 less than its tens digit. if the number is divided by the sum of its digits, the quotient is 6 and the remainder is 8. find the number. Have You ever heard of Everyday Mathematics? I am in 6 th grade my parents and I do not understand the problems. It is Unit 6 Checking Proggress.