exam Maths Puzzle Numerical Ability

how do you make equation that epuals to 31.

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exam Other Question

four pencils and 2 pens cost $2.26. six pencils and five pens cost $5.17. find the cost of the pencil. find the cost of the pen Greg spent 1/4 hour (h) responding to emails and 5/8 h returning phone calls. How much time did he spend on the two activities?