Question

read the text.
in lower - income countries, the high cost of medical equipment, such as microscopes, is often an obstacle to providing health care. stanford university professor manu prakash came up with a simple answer: he created foldscope, a microscope made almost completely of paper that costs less than a dollar. other equipment, such as centrifuges, needs electricity to operate. centrifuges spin blood samples to diagnose infections like malaria. to improve health care access in areas without electricity, prakash invented the paperfuge. the paperfuge is a centrifuge made of paper and string. it costs about twenty cents and doesnt require electricity.
match the problems with their solutions.
centrifuges are expensive and need electricity.
microscopes are expensive.
problem\tsolution
\tprakash invented a version made mostly of paper.
\tprakash invented a version made of paper and string.
work it out
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Explanation:

1. For the problem "Microscopes are expensive", from the text "the high cost of medical equipment, such as microscopes... he created Foldscope, a microscope made almost completely of paper that costs less than a dollar", so the solution is "Prakash invented a version made mostly of paper".
2. For the problem "Centrifuges are expensive and need electricity", from the text "Other equipment, such as centrifuges, needs electricity to operate... Prakash invented the Paperfuge. The Paperfuge is a centrifuge made of paper and string. It costs about twenty cents and doesn't require electricity", so the solution is "Prakash invented a version made of paper and string".

Answer:

• Problem: Microscopes are expensive. ; Solution: Prakash invented a version made mostly of paper.
• Problem: Centrifuges are expensive and need electricity. ; Solution: Prakash invented a version made of paper and string.