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Aditi, Becky and Cali collect coins. Aditi has 6 more coins than Becky. Cali has 1 less coin than Aditi. Altogether they have 71 coins. How many coins do they each have? Show all your working.

Form 3 equations. Equation 1: A= 6+ B.Equation 2 : C= A-1. Equation 3: A+ B+ C= 71.Substitute equation 1 and 2 into 3 to get: 6+ B + B + A - 1= 71 -> 2B + A= 66 which is equation 4. Then, substitute equat...
KS
Answered by Kelvin S. • Maths tutor
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How do you solve simultaneous equations?

There are two main methods:Substitution and elimination which can be demonstrated on the white board.
AC
Answered by Adham C. • Maths tutor
3256 Views

Explain the main structures of a human cell.

A human cell is made up of:Cell Membrane: provides structure for the cell and controls what goes in and outCytoplasm: Jelly like liquid which contains the organellesNucleus: Contains DNAMitochondria: Make AT...
AC
Answered by Adham C. • Biology tutor
3550 Views

How does natural selection occur?

A population of organisms exists with a set range of alleles. In an organism, a random mutation can result in the formation of a new allele. Some mutated alleles can be beneficial to an organism, and increas...
TP
Answered by Thendrral P. • Biology tutor
4390 Views

Why does food decay faster in hotter climates?

The key to this kind of question is how you word your answer - you vocabulary must be very specific.You are looking to highlight that microbes can respire faster, which in turn lets them reproduce and grow f...
CS
Answered by Conor S. • Biology tutor
3683 Views