exam Maths Puzzle Numerical Ability

The length of a rectangle is 4 times the width. What are the dimensions if the perimeter is 80?

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exam Other Question

Monohybrid Crosses with Incomplete Dominance-Genetic problems:
Red and white coat colors in Shorthorn cattle are due to a pair of alleles, which when heterozygous produce a roan c I need helping to solve using row operations on each system:
x+yz-3z=1
2x-y+z=9
3x+y-4z=8